when u find out who it is,stalk them,find out when they are not home, take your equipment back and only your equip.
take the plants and rip them up all over the persons house/apartment and pour the resevoir water on there bed/s
dont physically harm them.
lock your equipment up somewhere safe,open there front door stealthy when u leave and when u are back home and safe...call 911 and report seeing some weird activity.
the cops will assume someone broke in when they see the front door is open,theyll assume the owner forgot to lock the front door,and when they go in and see what happend,theyll see dead lucious plants around the house and maybe arrest the owner for growing.
when the perpetrators come home and see all that went down,theyll know who did it,witch if they come after you u can do some physical damage to there faces and bodies.
they also may say they stole there equip from u ect,so make sure u hide your equip at someones house, someone that is trusty and that lives at least 20miles away
be smart about your actions and be conspicuous