Andy would be thrilled to be arrested because he can perform his "I have autism, I can't DO ANYTHING!" routine and eventually he'll be released from custody and the charges dropped due to his being indigent and with schizo affective disorder. Lather. Rinse. Repeat.
What really needs to happen to Andy is he needs to die. And given how Andy likes to play with his own poop, he's at risk for Hepatitis-A. Andy's legs are certain to get diabetic gout, from the sheer volumes of peanut butter sandwiches and sodas he consumes. Andy won't listen to any doctors when the time comes to remove one of his feet. Then it'll spread to his other foot. Andy won't listen. The gout will inevitably work it's way into the legs, and assuming Andy is still mobile, he won't be for much longer. Andy will stage another fall to aggravate his back injury (his addiction to opiates was likely another reason he was kicked out of the hospital) - only this fall will do damage to his hip, which Andy will be in horrible pain from for the rest of his life. (serves the bastard proper for what he did to his mother!)
Hopefully Andy has developed an osteosarcoma by this time, and after Andy dies painfully by the age of 45, then we don't have to be MATI anymore!