In a last-ditch effort to pursue criminal charges against the Mesquite police officers who avoided accountability for the death of a teenager in their custody only because too much time had passed, representatives from the Dallas County district attorney’s office this week met with FBI agents to determine if federal laws might yet provide an avenue to justice.

Last week, the office of Dallas County District Attorney Faith Johnson said there was enough evidence against the police to charge them in Graham Dyer’s death. The 18-year-old was experiencing a bad reaction to LSD in August 2013 when Mesquite officers took him into custody. Dash camera videos obtained by his family despite the city’s efforts to withhold them showed police shocking Graham’s testicles with a Taser while he was handcuffed and allowing him to sustain fatal injuries hurling himself unrestrained about the back of their cruiser during transport to the jail.

Despite the apparent serious head injuries, Mesquite officials did not summon medical help until they observed Graham unresponsive in his cell — more than two hours later.

The incident came to the DA’s attention two months ago when the American-Statesman published an investigation about Mesquite thwarting the Dyer family’s attempts to obtain the records showing what happened to Graham the night he died. Yet by then, due to a 3-year state statute of limitations on criminally negligent homicide, Dallas prosecutors said the officers couldn’t be charged with the crime.

To hear from legal experts on the likelihood of criminal charges in this case, and more from the Dallas County DA’s office, visit MyStatesman.com