Thats incorrect in many ways as indeed I was a landlord for over 20 years in Mass. In addition if you put something in the lease agreement and it is agreed to by the tenant, you can evict. Now can they try and play games, sure, but if you know the system well that lasts about a month. Can they wreck the place before they depart? Yes and in those cases they ended up in court paying for it. Best tenants I had were section 8 and newly arrived immigrants, had very few issues and some great food and homemade booze from them. As I said before when they sign the agreement, thats it. Ive evicted for drug use, abuse of the property, non payment, etc. and it worked out ok through the court system.
In this case the tenant is not evicted "yet" and because I dont know what her rental agreement looks like I can only assume. From the letter her Landlord sent , it appears there was no clause banning firearms in the rental until (good for her), however she was given the OK by the local LEO that indeed she was obeying the bizarre storage laws we have and was in compliance with the local laws on her possessing the firearm. She is set to go through her interview with the CLEO this month (lets just hope he does not get politically influenced to deny her).
So yes tenants have rights, but lets not play it like they are the supreme beings of all rental land, they are not.
Only a month to evict in MA, seriously. I think every other landlord in MA, including those in this very thread have a lot to learn from you then bud.