Cell phone incoming call data was deemed suspect
If you listened to Serial, you probably remember that a lot was made of Syed's cell phone records, especially the incoming call data. Two of the people questioned by police after these records were obtained -- Jay Wilds and Jennifer Pusateri -- led to Syed getting convicted: Pusateri told police that Wilds had called her using Syed's phone, and Wilds confessed that he had helped Syed bury Lee's body in Leakin Park.
Wilds' confession didn't come until later, after he first denied being involved at all in what had happened, and supporters of Syed say that audio from his interviews with police reek of coaching. Another podcast series, Undisclosed: The State vs. Adnan Syed, produced in 2015 by one of Syed's advocates, lawyer Rabia Chaudry, found that in audio of Wilds' testimony, he seemed to respond to a tapping noise: Initially, he wouldn't know what to say to police interviewers until a soft tapping was heard, and then he'd become responsive.
Syed's lawyer Justin Brown claimed in 2015 that the cell data, provided by AT&T, wasn't a reliable form of evidence, citing AT&T's own warning that only the outgoing call data was accurate enough to be admissible in court: "Outgoing calls only are reliable for location status. Any incoming calls will NOT be considered reliable information for location."