I've been a police officer for 25 years, and I never understood why someone would admit to a crime he or she didn't commit. Until I secured a false confession in a murder case.
I stepped into the interrogation room believing that we had evidence linking the suspect to the murder of a 34-year-old federal employee in Washington. I used standard, approved interrogation techniques -- no screaming or threats, no physical abuse, no 12-hour sessions without food or water. Many hours later, I left with a solid confession.
At first, the suspect couldn't tell us anything about the murder, and she professed her innocence. As the interrogation progressed, she became more cooperative, and her confession included many details of the crime. The suspect said she had beaten the man to death and dumped his body by a river. She said she made purchases with the victim's credit card and tried to withdraw cash using his ATM card. Surveillance video from the ATM showed a woman who resembled the suspect, and an expert said the signature on the credit card receipts was consistent with the suspect's handwriting.
Even the suspect's attorney later told me that she believed her client was guilty, based on the confession. Confident in our evidence and the confession, we charged her with first-degree murder.
Then we discovered that the suspect had an ironclad alibi. We subpoenaed sign-in/sign-out logs from the homeless shelter where she lived, and the records proved that she could not have committed the crime. The case was dismissed, but all of us still believed she was involved in the murder. After all, she had confessed.
Even though it wasn't our standard operating procedure in the mid-1990s, when the crime occurred, we had videotaped the interrogation in its entirety. Reviewing the tapes years later, I saw that we had fallen into a classic trap. We ignored evidence that our suspect might not have been guilty, and during the interrogation we inadvertently fed her details of the crime that she repeated back to us in her confession.
If we hadn't discovered and verified the suspect's alibi -- or if we hadn't recorded the interrogation -- she probably would have been convicted of first-degree murder and would be in prison today. The true perpetrator of the crime was never identified, partly because the investigation was derailed when we focused on an innocent person.
