The LEO’s swat teams when they exeute these things never pre scout out their locations. They can do so simply by interviewing without tipping their hand the mail person who delivers to that location. Or have somebody pose as a delivery person. If they did that they’d be saving themselves a lot of grief.
If it’s a business like a tavern have somebody go in and check out to see if that suspect like a known thief or pusher is there. Been in one of those with two off duty coppers inside and nobody else. Just walked out and got stopped by one of the swat team members and told them who was in there but they didn’t listen. As they formed up at in both entrances and barged in with guns drawn (and laughed my phisteris off) but in this raid somebody could have gotten killed.