Really? Don't local cops/jurisdictions decide on how long the person has to be missing before they use up resources? Granted, you can file the report, but if you seen the person 6 hours ago, that isn't going to compel a police department to start looking immediately upon filing your missing person report.
No.
That is 100% false.
If you call 911 or go to a police station they will file a report regardless of time frame. If they have to close or cancel the report they will do so once the case is closed or completed, but they won't just not do anything and say "come back later" or "call back later."
That and police don't "actively" search for people.
They have all the missing persons data therefore if they get stopped by police or arrested or found dead, well, they know who they have.
They don't drive around the cities looking out there window for anyone who might've been reported missing. That's literally impossible. There's too many missing people. However there is certain things they keep an eye out for such as a missing endangered person, and armed person...obviously if a 6 year old goes missing in a neighborhood then you're going to have police and fire trucks, drones, helicopters...people actively searching.
But if you are 32 and you are reported missing, just gone, nobody knows where you are at and can't get in contact with you. They'll look for you, your bound to show up some where. A hospital, morgue, get arrested. Plus they take other information as well such as vehicle descriptions and license plate..with plate readers just like if your car is stolen it'll register car registered to a missing person. And you will get pulled over.
It's not a crime to be missing though. If you are an adult.