An amended Federal Rule of Criminal Procedure, which originated from an unelected advisory committee and was signed by the Supreme Court in April. By rule, it becomes effective December 1. The measure clarifies the law allowing judges to sign warrants that let authorities hack into computers outside a judge's jurisdiction. The rule also gives federal judges the authority to issue a warrant to search multiple computers—even without knowing who is the targeted computer owner. Previously, some judges had practiced this, while others did not.
Civil rights groups like the Electronic Frontier Foundation oppose Rule 41. They say that under the measure, a warrant would not have to say with any particularity whose computer the authorities are searching.
Read more here: http://arstechnica.com/tech-policy/2016/11/new-us-law-making-it-easier-to-search-computers-takes-effect-thursday/