Sometimes it can be suppressed, but not always. The Fourth Amendment requires that law enforcement get a valid warrant prior to searching your property. There are legally recognized exceptions to this, such as consent or exigent circumstances. Even if an exception doesn’t apply, the search can be subject to an exclusionary rule exception. Which means that even though the search was technically illegal, the evidence may still be taken into account – based on considerations such as inevitable discovery, or good-faith intention. Search and seizure law is very complex with pitfalls. If property is every subject to a warrantless search by enforcement agencies – you should speak to a federal defense lawyer who is specifically familiar with search and seizure laws.