A Connecticut judge says police have been improperly using data from cellphones to track the location of suspects.

New Haven Superior Judge Jon Blue agreed Monday to suppress evidence in a robbery case, saying it was the result of police improperly asking in advance to receive live updates from the phone company on the location of the suspect's cellphone

The ruling comes in the case of Terrance Brown, who was charged with robbing several automated bank teller machines in 2010.

Blue ruled the state legislature in passing a cellphone law did not intend for police to receive anything other than basic subscriber information without a warrant.

Deputy Chief State's Attorney Leonard Boyle says the state is reviewing the opinion and its impact, but has not yet decided its next steps.