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It's June 21st, 2011 at the Hinton State Lab in Boston.

The chemist Annie DuConn walks down an empty hallway and pierres around the corner.

At the end of the hall is a small conference room and in just a few minutes a meeting is going to begin inside that room, one that could upand her career and her life.

As a chemist for this government lab, DuConn's job is to test drugs that have been confiscated from alleged criminals.

DuConn is supposed to run drug samples through a battery of chemical tests proving conclusively that the samples are heroin, cocaine, or another illegal substance.

The identification of these substances is a key piece of evidence in the state's prosecution.

But for a long time now, DuConn hasn't been following the rules.

To keep her numbers high and maintain her status as a superstar in the lab, DuConn has been dry-living her test results, guessing about what drugs are sitting in front of her instead of running actual tests.

And her deception hasn't stopped there. At times, DuConn has had to cover her tracks when it turned out her guesses were wrong.

She's swapped drug samples from different criminal cases, implicating people for crimes they did not commit.

It was the only way to maintain the appearance that she was running real tests.

And then recently, DuConn committed another breach, taking drug samples from the lab safe without getting proper permission.

It's a serious violation of the lab's rules, and DuConn appears to have been caught.

She's about to meet with her bosses to discuss the issue.

And this time, if she can't cover up the truth, she could face suspension or something far worse.

DuConn steps into the conference room where she finds several of her colleagues seated at a wooden table.

One of them is Charles Salamy, her direct supervisor. Next to him is Julie Nasef, the head of the lab.

The two supervisors are joined by Elizabeth O'Brien, an evidence officer who's in charge of managing the lab's secure safe.

DuConn takes a seat at the table and shoots for colleagues a confused and innocent look.

I understand there's a problem. What's going on? I'm happy to help however I can.

O'Brien, the evidence officer, leans forward. Annie, I've been going over records for old samples, and I've noticed some irregularities.

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