In the USA, the claim has to be convincing to a judge, so it’s not quite as arbitrary as you indicate.
In order for ICE to raid homes they need to have a valid warrant signed by a judge, but that doesn't seem to be stopping them in Minneapolis doing warrantless raids.
Clearly, the bar for it to be convincing seems quite low here
In order for ICE to raid homes they need to have a valid warrant signed by a judge, but that doesn't seem to be stopping them in Minneapolis doing warrantless raids.