Actually, that's what people in med-mj states do.
If someone breaks into your house and steals your medicine, you report that crime to the cops. And the cops investigate and have made arrests, recovered the medicine, returned it to it's rightfull owner, and prosecuted the offender.
-A couple of years ago a patient in The Triangle got ripped off--someone stole his medicinal plants from his back yard. The guy made a report and submitted a claim under his homeowner's insurance, and State Farm paid off on the claim.
I talked to one of the cops involved in that and he told me they treat it the same as if someone goes into your back yard and steals your bike, for instance.
Add: Some people in The Triangle, upon setting up an indoor garden, call the cops to come out for a look-see to make sure their garden complies with state guidelines for a legal garden.