There are rules and regulations that surround police searches. The police can search your home, property, car, or financial records if they have probable cause to believe that they'll find evidence of a crime, and therefore receive a search warrant issued by a judge.But in some situations, the police can also conduct a search without a warrant. If, for example, a potential piece of evidence is sitting out in the open, where there is "no reasonable expectation of privacy" then the police aren't required to have a search warrant to conduct a search. They also don't need a warrant if you voluntarily agree to a search. Many people have let the police search because they did not know they had the right to refuse. The police are experts at making people consent when they need to be.