Normally I'd love to pick holes in your story... but...
The fact that you were a cop at the time makes me think the story may be BS. most men wouldn't allow themselves to be slapped. I can't imagine a cop taking it, or even ending up in a situation where a slapping is imminent. A guy like defendis - who in 88 was a new pro and allegedly dealing out the ass (arrested shotly after) woudln't be slapping cops.
I gotta go with 'story not true' on this one.
There is no "maybe" about it....
In the 20 years that has passed since the 88 USA...this story has never surfaced ONCE, never saw print...nothing.
The fact I was a cop was irrelevant, as he probably wouldn't have known me, or what I did....
Even funnier to me, is the fact that I didn't even know who he was, as he was making a comeback from the late 70's!