Without getting into my business model...
I rent housing to medical doctors in Metro Detroit on Training. Everyone in the house is a doctor, medical student, resident. Someone could be a 4th Year Medical Student from Seattle doing a 4 week ENT Rotation. Someone could be from Saudia Arabia here for 3 month 'fellowship' in Cardic Intervention Techniques. Someone could be here from Nepal who is a doctor in their home country but wishes to complete residency in the USA, and is completing a Step 1 or Step 2 exam.
Point is people will do things such as take people's laptops or backpacks. Or they have money to pay for their housing stay, but then they meet someone from their home country less fortunate and then they allow them to stay with them, or 'crash' on the couch. Two guests will be Argentina and they will celebrate a big win in the World Cup and leave the kitchen trashed for 2-3 days, or more. You don't know who created the mess. If we clean it up, it encourages them to be irresponsible, if we 'fine' everyone in the house it creates a problem.
A guest might be headed to Boston for their next training rotation and the other returning to South Sudan, and they see the trunk where we keep extra pillows, blankets, etc. They decide to help themselves to these blankets. Well, 2 people left on the same day. Their Flight was at 6AM and 3AM. When I show up at 10AM I just see everything is gone. How do I know who stole?
These people are vetted, they are referred through the hospitals they are providing training. This isn't a 'typical' boarding house. But as you see we still have certain challenges because people are people.
We tried to not have cameras, but the breaking point was I showed up one-time on a Saturday morning at 5AM and found two people sleeping on the couch. Okay maybe they were hanging out and stayed the night. That would just constitute a warning. But instead, everyone in the house said they didn't know who the people were or denied there was someone in the living room sleeping (I took a pictures). Once that happened I realized that people were openly blatantly breaking the rules and there would be potentially more issues.
Every door has electronic locks with a personalized door code only the guest has (I have a key and a owner code). The front door to enter the house has a code. But I caught a non-guest enter the house one-time with the code. I was there cleaning the person opened the door and I was standing right there. Again, upon questioning no one could say who this person was.