Yea, you need probable cause to believe crime is being committed. You apply for a search warrant with a judge. He approves it or doesnt.
We have the constitution and the bill of rights, the 4th amendment protects us from illegal searches and seizures. So that warrant will be very specific as to what they're looking for and where they can look for.
It's not a simple process. And law enforcement donthave unlimited resources. Or free reign to do whatever they want.
(Not arguing with you, just making conversation)
For e.g. just recently I seen a cop pull someone over for a broken taillight. They pull him over, they find out hes drunk. He fails sobriety test yadayadayada...
He gets arrested.
The defense asks why did you pull my client over? The cop says broken taillight.
Defense shows him a picture of the tail light, and says it wasnt broken. Cop is a stand up guy, says yes I noticed upon further inspection that the taillight wasnt actually broken.
The guy gets off. That's the protection you get from the bill of rights. The guy was illegally "searched and seized" so anything found from that illegal search and seizure, cant be used in court. So the fact he was drunk couldn't be used.
I'm just using that as an example, and I too have a different perspective on these situations compared to typical forum members.