Everybody has a few skeletons in their past, things they may be embarrassed to admit later in life once they've reached a certain position and achieved a respectable reputation. I'm sure this has happened to people in positions of authority, like, let's say, police detectives who might be uncomfortable or unwilling to admit to the errors in judgment they made in their carefree youth.
Let's take LAPD Detective Michael Raines, for example.
He's got enough troubles to deal with now as it is, considering he "sees" the ghosts of murder victims. Unlike the main characters in 'Medium' and 'The Ghost Whisperer', Raines' spirits haunt him because in some ways he's mentally unbalanced since the shooting of his partner.
So I'm sure it will never come up that before he became a policeman, 'Raines' was a university student caught up in the political unrest of the mid-1970s as he joined in the protests against the Suarian government.
Proof of his involvement at rallies outside the Suarian consulate in Los Angeles can be found here.
But you really should check out the whole site. It's the best damn website for Columbo I've ever visited! (But for great 'Columbo' fanfic, visit "Just One More Paragraph". You'll find the link to the left......)