Critics such as EPIC and the ACLU strongly criticized the law for violating the Fourth Amendment, with the ACLU going so far as to release an advertisement condemning it and calling for it to be repealed.
EPICやACLUは修正第4条違反だとして愛国者法を強く批判し、ACLUはそれを批判する広告を流し続け、その廃止を呼びかけた。