The good-faith exception may allow some evidence gathered in violation of the Constitution if the violation results in only a minor or technical error. If a magistrate is erroneous in granting a police officer a warrant, and the officer acts on the warrant in good faith, then the evidence resulting in the execution of the warrant is not suppressible. However, there are a number of situtations in which the good faith exception will not apply:

1. No reasonable officer would have relied on the affidavit underlying the warrant.
2. The warrant is defective on its face for failing to state the place to be searched or things to be seized.
3. The warrant was obtained by fraud on the part of a government official.
4. The magistrate has "wholly abandoned his judicial role."