I'm coming from a position of having several extended family members who have problems with pills. Do not let this person in your house. If you want to see this person at a coffee shop or whatever to support them while they are getting their shit back together, do so. Do Not Let This Person Back Into Your House.

If in several months / years when this person has completed a recovery program and is sticking to it you want to let them back into your house, take all your prescriptions and lock them up in something like a fire safety box that you hide in an out of the way area like the back of a closet behind the holiday wrapping paper or in the sideboard where the china currently in use usually resides (or remove to a secondary location like someone else's house), yes all of them. This person has a history of stealing meds and trying to cover it up, therefore you can never ever ever trust them around your meds again. (It sucks. Let me tell you what getting the house ready for family holiday parties looks like.) It does not matter how long the person has been in recovery for. You have to lock up your meds every time they come over.

Also maybe check in with a therapist on why you want this person, who has stolen from you and fucked with your medication, back into your life.