Attorney William Newman and I co-authored, on behalf of the ACLU of Massachusetts, an amicus brief regarding the legality of imposing GPS devices on all defendants who accept continuances without a finding (CWOFs) rather than guilty pleas to sex offenses and who then become subject to conditions of probation. The brief was filed on August 24, 2015 in support of the defendant in Commonwealth v. John Doe, SJC-11861. The case has been argued and is currently pending in the Supreme Judicial Court.
The amicus brief argues that if the Supreme Judicial Court finds that the legislature allows such GPS impositions, there are two serious constitutional questions which result: 1) Whether a 24/7 search and seizure without reasonable suspicion is allowed under the Fourth Amendment and Article 14; and 2) Whether this invasive punishment is cruel or unusual under Article 26 of the Massachusetts Constitution. You can link to the amicus brief here: https://static1.squarespace.com/static/53920cf8e4b0f5d5f60ee66a/t/560db674e4b088a188aa9968/1443739305614/Doe+ACLU+Amicus+Brief+%28in+SJC%29.pdf