When I was a kid back in the '60s, a TV news crew accompanied police who were serving a warrant. They "knocked and announced" and within seconds were pounding on the door with a sledge hammer. (No battering rams back then.) They pounded and pounded, and then a small window in the door opened and the occupant asked who was pounding on his door.
"POLICE! WARRANT! OPEN UP NOW!
The resident demanded to see the warrant. There was quite a bit of back & forth between the cops and the occupant, but he DID NOT open the door until the cops produced the warrant - and he made them hold it up so he could read it.
Several occupants were in the house, much anger by the cops at the guy for refusing to open the door until he could read the warrant, and even MORE anger because the door was HEAVILY reinforced inside - they even had a bar across it like the gate in an old time fort or castle. Why? "We have a lot of crime here and you cops don't come when we call for help."
No drugs were found, no arrests made.
This was decades ago and perhaps my childhood memory of the incident isn't perfect, but it still makes me think -
why wouldn't a REAL
drug dealer today fortify his own drug den to delay forced entry?