U.S. Border Patrol conducted another immigration security checkpoint in New Hampshire, on I-93 South in the town of Woodstock.

Woodstock Police Chief Ryan Oleson confirmed that a checkpoint took place. U.S. Customs and Border Protection alerted the local police to the checkpoint via a fax Tuesday morning.

Federal law allows Border Patrol agents to conduct operations within 100 miles of international borders.

Checkpoints in May and June on I-93 in Woodstock resulted in 22 arrests on drug and immigration charges.

The American Civil Liberties Union of New Hampshire reissued its constitutional primer on checkpoints on Tuesday. The ACLU advises motorists to know their rights, including that one "may video or audio record federal agents so long as you do not interfere with their work. In cars, it's advisable that a passenger do the filming, or that a dash cam device be used."