What changes after 26 years behind bars?

(CBS) - California man Bruce Lisker spent 26 years in prison for a crime that he didn't commit - the murder of his mother. What changes for an innocent man after he's had his freedom taken away for over two decades?

48 Hours Mystery asked him, now that he's a free man, what changed in those years. He said via e-mail, that "having endured what I was forced to endure...I find myself feeling not only middle-aged, but some days quite haggard and challenged to meet my days with a persistent smile."

"Some might think going from the hell of prison to freedom would be a cake walk. I even thought so for a short time. But it's not."

Lisker says that he views police officers differently. "I'm obviously not a lawbreaker, but there is a certain sense of dread when a black-and-white drives alongside me."

How can you tell, he wonders, good cops from bad cops? "The bad ones don't were special hats, and in fact their dishonesty thrives on their appearing as the honest ones do."

The story of Bruce Lisker will be covered on 48 Hours Mystery this Saturday at 10/9 c.