The investigation · Palo Alto, CaliforniaCase file 2003–2018
John Carreyrou2018Investigative reporting
BadBlood
Secrets and Lies in a Silicon Valley Startup
A startup promised a full lab in a finger prick. This is how the claim stayed alive for years, and how a few people with notes and a reporter brought it down.
A wide range of lab tests from a few drops of blood.
The device
The Edison, later the miniLab.
Where
Wellness centres inside Walgreens stores.
Who checked
Former employees, a reporter, then federal lab regulators.
Finding
Its own devices did not do what was claimed.
Claim not supportedsee the record
HourLife's summary of the public record the book reports. Not a real document.
The core idea
The device didn’t deliver. The silence did.
John Carreyrou is a longtime investigative reporter at The Wall Street Journal. Bad Blood tells the story of Theranos, the blood-testing startup Elizabeth Holmes founded in 2003 as a 19-year-old Stanford student, which claimed it could run a wide range of lab tests from a few drops of blood. The book follows the company through its deals with Walgreens and Safeway to the point where Carreyrou's reporting, starting with a Journal story in October 2015, showed that its own devices did not work as promised. It is built on interviews with former employees, including the whistleblowers Tyler Shultz and Erika Cheung, and on the records they kept. Read as a lesson, it shows how secrecy, pressure and a promise that sounded too good kept a company going long after the warning signs were there to see.
The book reads like a thriller, but its lesson is ordinary. Theranos did not need everyone to be fooled. It needed the people who could see the problem to stay quiet, and the people who could not see it to stay impressed. Secrecy, pressure and a famous board did both jobs.
The same pattern turns up far from Silicon Valley: in a job that sounds perfect, an investment that cannot lose, a boss who treats questions as betrayal. You don't need a newsroom to spot it. You need a few plain questions and the nerve to ask them out loud.
Flag family 1
The promise
A claim that beats what experts think is possible, with proof only the seller has seen.
Flag family 2
The secrecy
Questions met with confidentiality, people kept apart, and no one free to talk.
Flag family 3
The pressure
Deadlines that rush you, doubters pushed out, and lawyers where answers should be.
Interactive · the red-flag audit
Check the claim before it checks you.
Twelve warning signs from the Theranos story, four in each family. Run them on a job offer, an investment, a product or a partner you're weighing. "Can't tell" counts too: when you can't find out, that is part of the answer.
Optional. It goes on the file you copy. Nothing you type leaves this browser.
The promise
4 checks
A claim that beats what experts think is possible, with proof only the seller has seen.
The secrecy
4 checks
Questions met with confidentiality, people kept apart, and no one free to talk.
The pressure
4 checks
Deadlines that rush you, doubters pushed out, and lawyers where answers should be.
Your file
The read-out
One square per check. Red is a flag you can see.
Promise
Secrecy
Pressure
YesCan't tellNo sign
Answer all 12 checks to get a read-out.
Ask next
HourLife's checklist, drawn from the patterns the book reports. The checks and the read-out are ours, not the author's. A thinking aid, not legal, financial or medical advice. Your answers stay in this browser.
Concept anatomy
How a claim like this stays alive, and what breaks it.
Each link in the chain protects the one before it. The truth got out because a few people refused to be one of the links.
What kept it going
01
A promise worth wanting
A lab in a finger prick: cheaper, faster, less painful. People wanted it to be true, which made them slower to check.
02
Secrecy inside
Teams kept apart and work kept confidential, so no single employee could see the whole picture.
03
Pressure on doubters
People who raised concerns left or were pushed out, and the ones who stayed learned what questions cost.
04
Borrowed credibility
A board of famous statesmen and generals, big-name partners and glowing press stood in for proof.
05
Lawyers at the door
Former staff and the newspaper faced legal pressure, which made speaking up costly for anyone with something to lose.
What broke it
Insiders who kept trackEmployees who saw results they could not trust, said so inside, and later took what they knew to regulators and a reporter.
Tyler Shultz · Erika Cheung
A reporter who checkedSeveral sources, doctors and documents, not one tip, before the story ran in October 2015.
John Carreyrou
Regulators who inspectedFederal lab inspectors examined the lab, and in 2016 regulators sanctioned it.
The public record
The record, year by year
2003Holmes, a 19-year-old Stanford student, founds the company that becomes Theranos. She soon leaves Stanford to run it.
2013Theranos testing opens inside Walgreens stores, starting in Palo Alto.
2014The company is valued at about $9 billion.
2015In October, the Journal runs Carreyrou's first story on the company.
2016Theranos voids two years of results from its Edison devices, and regulators sanction its lab.
2018Bad Blood is published. Later that year, Theranos dissolves.
2022In January, a jury convicts Holmes on four counts of fraud.
Dates from the public record. 2022 comes after the book.
Community insights
What readers take from it.
HourLife's takeaways from the book, ranked by reader votes.
Exhibit 01HourLife takeaway
A promise that skips the proof stage is a story, not a product.
Theranos pitched a full lab in a finger prick, and investors, partners and the press bought the pitch before anyone outside had checked the machine. The book shows the company's own Edison device could not do what was claimed, so many tests were quietly run on modified commercial analysers made by other companies. The question that would have caught it early was simple: who outside the company has seen this work?
Exhibit 02HourLife takeaway
Secrecy that protects an idea can also hide the fact that the idea does not work.
Teams at Theranos were kept apart, and staff were told not to discuss their work with colleagues in other groups. That made it hard for any one person to see the whole picture. When nobody is allowed to compare notes, a problem can stay invisible for years.
Exhibit 03HourLife takeaway
Famous names are not the same as people who know the field.
The Theranos board was full of former cabinet secretaries, senators and military leaders, and almost nobody with a background in lab medicine. Their names made the company look checked when it had not been. When you weigh a claim, ask whether the people vouching for it could tell if it were wrong.
Exhibit 04HourLife takeaway
When asking questions costs people their jobs, the questions are the point.
Carreyrou follows employee after employee who raised a concern and then left or was pushed out. Each departure removed one more person who might have said no. A place that treats doubt as disloyalty is telling you what it fears.
Exhibit 05HourLife takeaway
Courage often looks like one junior person keeping careful notes.
Tyler Shultz and Erika Cheung were young employees in the lab, not executives. They saw test results they could not trust, raised it inside, and were brushed off. What they had seen, and later told regulators and a reporter, was a large part of how the truth got out.
Exhibit 06HourLife takeaway
A partner's fear of missing out is not due diligence.
Walgreens opened Theranos testing centres in its stores, starting in 2013, without independently checking that the technology worked. The prospect of being first can make a careful organisation skip the checks it would demand from anyone else. Pressure to move fast should slow you down.
Exhibit 07HourLife takeaway
Threats aimed at critics tell you something about the claim.
Theranos used its lawyers to press former employees and to try to stop the Journal's story before it ran. Tyler Shultz faced that pressure while his own grandfather, the former Secretary of State George Shultz, sat on the board. Honest work can usually survive a question without a lawsuit.
Exhibit 08HourLife takeaway
Someone always pays for the gap between the pitch and the lab.
Here it was patients and doctors, who made decisions on test results that could be wrong. In 2016 Theranos voided two years of results from its Edison devices. The cost of a too-good claim rarely lands on the person making it first.
Exhibit 09HourLife takeaway
Check a story the way a reporter does: more than one source, and the records.
Carreyrou did not run the story on one tip. He found several former employees, spoke to doctors, and asked for documents before publishing. You can use the same method on a job offer, an investment or a headline: find people who are not selling it, and look at the evidence yourself.
Action steps
Set your checks once, then keep asking.
Set up once5
01
Write your show-me list
Pick the biggest claim you are being asked to trust right now, from a job offer, an investment or a product. Write down three things you would need to see with your own eyes before you believe it.
02
Find one independent checker
Name one person outside the deal who knows the field: an accountant, a doctor, an engineer, a friend in the industry. Send them the claim this week and ask what they would check first.
03
Set a no-rush rule
Decide now that any big decision waits at least 48 hours, however hard you are pushed. Write the rule down where you will see it when the pressure comes.
04
Read what you are asked to sign
Before you sign a contract or a confidentiality agreement, read it in full and note anything that stops you talking about problems. If it worries you, ask a lawyer before you sign, not after.
05
Know where you would report
Look up who regulates your field and whether your workplace has an ethics or whistleblowing line. Save both in your notes, so you are not searching for them on a bad day.
Keep doing4
06
Keep a dated record
When something at work seems wrong, write down what you saw, when, and who was there, the same day. Keep the notes somewhere you control.
07
Ask how we know
Once a week, in a meeting or a conversation, ask the plain question: how do we know this works? Notice who welcomes it and who goes quiet.
08
Find one source that is not selling
Each time a big claim reaches you, find one source that does not come from the company or person making it. If you cannot find one, treat the claim as unchecked.
09
Talk to someone who left
Before you join, invest in or partner with a company, talk to one person who used to work there. Ask what they would want to know if they were in your place.
The more a claim needs your silence, the more it needs your questions.
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Week 1
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Frequently asked
What is Bad Blood: Secrets and Lies in a Silicon Valley Startup about?
John Carreyrou is a longtime investigative reporter at The Wall Street Journal. Bad Blood tells the story of Theranos, the blood-testing startup Elizabeth Holmes founded in 2003 as a 19-year-old Stanford student, which claimed it could run a wide range of lab tests from a few drops of blood. The book follows the company through its deals with Walgreens and Safeway to the point where Carreyrou's reporting, starting...
What are the key takeaways from Bad Blood: Secrets and Lies in a Silicon Valley Startup?
HourLife’s key takeaways include: A promise that skips the proof stage is a story, not a product. Secrecy that protects an idea can also hide the fact that the idea does not work. Famous names are not the same as people who know the field.
Who should read Bad Blood: Secrets and Lies in a Silicon Valley Startup?
It's a strong pick for readers exploring Become Hard To Manipulate, Character & Integrity, and Leadership & Management. HourLife distills its core idea into key insights and practical actions worth trying.
What's one thing I can do after reading Bad Blood: Secrets and Lies in a Silicon Valley Startup?
Write your show-me list — Pick the biggest claim you are being asked to trust right now, from a job offer, an investment or a product. Write down three things you would need to see with your own eyes before you believe it.
How long does it take to read the Bad Blood: Secrets and Lies in a Silicon Valley Startup summary?
About five minutes. The HourLife summary distills Bad Blood: Secrets and Lies in a Silicon Valley Startup into its core idea, 9 community insights, and 9 practical actions you can apply right away.
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