1. That would require an significantly increased number of police given the number of day to day interactions. There is already a shortage of police. 2. Why no

1. That would require an significantly increased number of police given the number of day to day interactions. There is already a shortage of police. 2. Why not just keep the door closed if you suspect such a thing? What could a stranger want that would be worth the hassle of getting a police officer that would be worth it? I personally never bother answer the doorbell unless there is a package coming I know I must sign for. Everyone else is selling some poor value service or product.