There are other sources of information beyond the youtube descriptions. Did you read the link?
To me, investigator for the fed is close enough to cop, and on the TV show they went into more detail about his long past in law enforcement and I think they said he was once a "cop", but to be completely honest I actually mistook his record for the retired officer who asked him to perform and put the event on when I wrote the description, (he is definitely a retired LAPD officer).
How about "retired Federal Officer at an event put on by retired LAPD officer for retired and current LAPD"...would that placate you? I can't see why, but because it disturbs you so...fixed?

I think you're jumping on what you perceive might be a minor factual mistake (I don't see it that way, I see no meaningful distinction between a federal cop and a city or state cop), one that makes no difference to the outrageousness, to avoid the issue. It's a tactic I've seen you use before. If you held yourself to the same standard of perfection, that would be something.

What I found most telling was his statement...
"We asked why Fishell would sing this in a room full of cops, and the lawyer replied, "He thought the room would get a kick out of it." "
This guy was once law enforcement, and is still friends with current and retired law enforcement, and that's how he thinks you all would react...and he was right, no one objected in the room of cops, their friends, and their family. That's the part that was the most telling, and the worst, in case you misunderstand.
One person acting badly is just one person. His feeling that cops would enjoy that is disturbing. The rest of the room, 1/2 full of cops, enjoying the act, or even just giving that kind of disgraceful performance the respect of sitting there listening without anyone objecting or leaving, that's disgusting.

"Singer Gary Fishell is a P.I. who once worked as an investigator for the Federal Government."

So you're correct: he wasn't a retired cop.