Hey there!
The 4th Amendment protects against unreasonable searches and seizures, which is basically saying that you have to have a search warrant for what you will be looking for and seizing. Once you have that, it is totally cool to search and seize if you're allowed to! If searches and seizures weren't allowed, the FBI and the police wouldn't exist! Searches and seizures that are permitted are essentially during things such as investigations.
I hope that this helps! Have a wonderful day!