In a 121-page memo, the U.S. Department of Justice to approve warrantless surveillance because GPS technologies are advances that merely help law enforcement do its job better.

In its report, The Constitution Project said that if the Supreme Court sides with the government in the case, the Congress should enact legislation requiring court warrants for any location tracking lasting more than 24-hours.

"We believe that such transformative changes in technology must be recognized in the law to ensure that Fourth Amendment protections continue to apply," the committee noted.

The report comes at a time when courts around the country have appeared split on the issue of warrantless location tracking. While some courts have upheld the government's use of warrantless tracking of suspects in criminal cases, others have rejected such tracking.

Jaikumar Vijayan covers data security and privacy issues, financial services security and e-voting for Computerworld. Follow Jaikumar on Twitter at , or subscribe to . His e-mail address is .