Im an LEO and I have not seen a mini-14 in use since 1991. Must be small agencies using them because M4's are the industry standard for law enforcement. We are only authorized to carry COLT, SIG, DD, LWRC, Bushmaster, RRA, or BCM. The majority of Deputies carry COLT 6940 or 6920, SIG M400, or Daniel Defense M4. We are not allowed to carry a mini-14 as they are antiquated and lousy rifles for CQB engagements. I would not want to take a mini 14 into a gun fight and have to reload in a hurry!
May God make smooth the path you follow!