If you're joking, it is kind of funny, but I wouldn't. When your in law enforcement, you pretty much don't want to be thinking/ talking/ doing anything law enforcement on vacation. Probably the toughest thing about being a cop is NOT being a cop when you're off-duty.
Who knows, they might think it's funny, but imagine if they don't. My dad once told me that he went into a store, and there were a lot of cops in there, and he joked by saying light-heartedly "Gee, the donuts must be really good here?" Well, after about 10 "I otta kick your ass" looks, he realized the donut jokes are played out. Actually, I thought it was pretty funny.
Instead, when you first meet them why not ask them if they want to buy a little weed?
:guitar: