BALTIMORE (AP) – An attorney for a convicted killer at the center of the popular podcast “Serial” has filed a motion arguing that cell tower data placing the man near the murder scene was inaccurate and should not have been introduced at trial.

Justin Brown, an attorney for Adnan Syed, who was convicted in 2000 of killing his high school girlfriend and whose case was revived in “Serial” podcast, says the state used cell tower data to link Syed to Leakin Park, where the woman’s body was found.

However, in a note attached to the data, AT&T warned that only outgoing calls can be traced, and that “incoming calls will not be considered reliable information for location.” Despite this note, Brown argues, the state used the data to trace incoming calls.