Knocking and talking...

The question was recently asked, "Why did the police come knock on the door to my apartment for no reason and ask me about selling drugs?"

It is a fact of life that when people sell drugs, their customers will often tell the police about that.  There are very few people who can keep a secret.  Actually, we police officers depend a great deal on people who are willing to talk about about crimes being committed by other people.

So in answer to the question posed above about why the police came to the apartment, somebody, either a so-called friend or a drug-buying customer or another person with knowledge of what is going on, called the police and told about the person selling drugs.

A good police officer is an inquisitive person.  The officer will follow up on what has been reported by knocking on that front door and simply asking questions, talking to whomever answers the door.  Quite often, that conversation will develop additional information to cause the police officer to investigate further, leading to the arrest of a drug seller, seizure of illegal drugs, and so forth.

It is, after all, what the taxpayers are paying police officers to do.