Lets suppose, just as an example, you do decide to be a cop and your first week on the job, you get stuck partnered up with some gung-ho douchebag to "show you the ropes". You get a call to a tavern on a report that someone is outside on the hood of his car drinking a beer illegally, he's a little drunk but not bothering anyone, yet for some reason or another, some busy body type prick calls you guys out and you're forced to respond. Will you go against your partners instructions to put your club across his neck if he doesn't comply while he puts the cuffs on, or will you just go along? If you dont, you wont last long. If you do, you've already sucked the states cock and it would be very hard for you to go back and start over.
Just my opinion.
I wouldn't do it.