TS...the answer is NO. (for my agency)
My question to you TS is, generally speaking, how long/much training do think is necessary for experienced shooters to become profecient in fully automatic carbine fire? Including sustainment training.
My agency has M-4's with the fun button. These are issued to tactical teams who IMO do not get nearly enough training on full auto to be safe or effective. I suppose its good to have the capability of full auto (assuming adequate training) if you need it. The situation my agency purchased the M4's were for the Bank Of America type nightmare in which an officer/civilian gets hit and is in need of rescue. We also got a nice grant from Uncle Sam
IMO full auto has very little space in urban LE.