The use of a police Taser on a man who allegedly stuffed a bag of cocaine in his mouth during questioning has sparked an investigation by Suffolk County police.

A Southampton police officer used the Taser twice on 26-year-old Tony Curtis Bradway to stop him from swallowing the drugs, police say. Bradway spit out part of the bag and some white paste. He died nine hours after the incident.

This latest death of a suspect after being Tasered by police is raising questions about the use of Tasers in general. There have been at least three other deaths on Long Island since 2004.

Attorney Fred Brewington represents the families of two Long Island men who were killed after being Tasered by police. He believes the Taser is a lethal weapon that has not been fully regulated or tested. Brewington says the weapon was a major contributing factor in the deaths of these men.

Winthrop University Hospital Chief of Cardiology Dr. Kevin Marzo believes a patient?s health and possibly whether he or she is on drugs, could make a Taser lethal. However, he says more study is needed.

Police departments on Long Island have their own internal rules on who can carry and use Tasers. Beginning Wednesday, thousands of NYPD sergeants will carry the devices on a daily basis.

Suffolk homicide detectives say they are awaiting the results of a medical examiner's report for an exact cause of death in Bradway?s case.

Just how safe are Tasers? Click here for more