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In page Patriot Act:

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Opponents of the law have criticized its provision for indefinite detention of immigrants; permission to law enforcement to search a home or business without the owner's or the occupant's consent or knowledge under certain circumstances; the expanded use of National Security Letters, which allows the Federal Bureau of Investigation (FBI) to search telephone, email, and financial records without a court order; and the expanded access of law enforcement agencies to business records, including library and financial records. Since its passage, several court challenges have been brought against the act, and federal courts have ruled that a number of provisions are unconstitutional.[citation needed]