,IMHO, he would have remotely set it the morning when his mom said she was having problems. He didn't.
Please correct me if I'm wrong..... I don't remember reading (so much info---my memory is mush!) in docs or here if it's known exactly HOW the alarm was deactivated. Forensic techs can tell WHEN an alarm is activated/deactivated but can they determine HOW---whether physically from the touch-pad, remotely from a cell OR burner phone or any other device???
I'm thinking IF this can be determined THEN LE knows but isn't releasing that info (we do know that MS told BS to leave the alarm off that day). IF this is true and MS deactivated it himself remotely.... he may (I would think?) have done it from a burner phone---IF SO, wonder how many burner phones were purchased with cold cash by MS and only for MS's use, unbeknownst to the Master Mind In A Green Dress.
Of course, burner phones complicate things. I don't know what LE can obtain as evidence proof-wise other than the just knowing the perps were using them at certain times.