Usually you're not immune from prosecution; they just suppress the evidence collected in that search so that it cannot be used against you (this is a simplifica

Usually you're not immune from prosecution; they just suppress the evidence collected in that search so that it cannot be used against you (this is a simplification; there are a number of reasons why this evidence can be used against you anyway, generally amounting to `they would have another legal way of discovering the same fact about the crime').