During the course of their investigation in the second episode of 'Burn Notice', Michael's friends Sam and Fiona passed themselves off as Miami detectives by the names of Cagney and Lacey.
It's a funny enough in-joke, especially considering the fact that one of their co-stars is Sharon Gless. She played Chris Cagney in 'Cagney & Lacey' from the 1980s.
But in the reality of the TV Universe, that would have been a risky move had 'Cagney & Lacey' been a cop show in that dimension as well. Either one of their two marks (Greg and Bonnie) could have remembered seeing the show in reruns. And the DVD boxed set of the first season was recently released, to boot. (I mean "as well", not "to boot" as in "bootleg edition"!)
However, in Toobworld, 'Burn Notice' shares the same dimensional plane of existence as 'Cagney & Lacey'. So Greg & Bonnie more than likely had no reason to know who a couple of NYPD broads (Sorry, didn't mean to channel my inner Gene Hunt!) er, female detectives are.
But Sam probably not only knew of them, he may even have known them personally. It could have been in the line of duty when he was a younger spy, but his connection to them may have moved on from there. We know Sam has an eye for the ladies, and he's not above making a play for a skirt that's not quite in fashion anymore, shall we say.
So who knows? Maybe Sam and Chris Cagney played a little flat-footsie at one time.....