been reported in fentanyl overdose for example where someone becomes very sleepy and then sort of gradually calmly peacefully stops breathing this was not that kind of a death thomas said there is no evidence to suggest george floyd would have died that night except for the interactions with law enforcement she added breahna giles a forensic scientist for the bureau of criminal apprehension breahna giles said some of the pills in floyds suv contained methamphetamine and fentanyl in this image taken from video witness breahna giles a forensic scientist with the minnesota bureau of criminal apprehension testifies on april 7 2021 in the trial of dere show more court tv via ap she testified on april 7 about evidence collected at the crime scene in floyds suv and in the squad car officers tried to place floyd susan neith susan neith a forensic chemic at nms labs in pennsylvania testified on april 7 that two pills found in floyds suv and a partial pill found in the squad car contained a fentanyl concentration of less than 1 which she said is common in this screen grab taken from video susan neith minnesota forensic chemist testifies at the trial of derek chauvin on april 7 2021 in minneapolis minn pool via abc news the pills contained a methamphetamine concentration of 19 to 29 which she described as significantly lower than street meth the majority of the time i see 90 to 100 methamphetamine she added dr bradford langenfeld bradford langenfeld who was a senior resident in the emergency room at hennepin county medical center in may 2020 testified on april 5 that officers decreased floyds chances of survival by not administering cpr its well known that any amount of time that a patient spends in cardiac arrest without immediate cpr markedly decreases the chance of a good outcome approximately a 10 to 15 decrease in survival for every minute that cpr is not administered he said langenfeld was the doctor who declared floyd dead and said floyd likely died from asphyxia this is contrary to the defenses angle that floyd died of a heart attack or drug overdose emergency room doctor at the hennepin county medical center dr bradford wankhede langenfeld takes the witness stand on the sixth day of the trial of former min show more court tvpool via reuters defense attorney eric nelson tried to tie floyds death to using fentanyl and methamphetamine drugs found in his system during an autopsy langenfeld agreed that the use of those drugs can cause shortness of breath and suppress breathing more many of derek chauvins law enforcement colleagues disagree with how he restrained george floyd heres how they have testified floyd was in cardiac arrest for at least an hour a halfhour as paramedics worked on him and another half hour at the hospital where langenfeld and his team worked on him before his death seth z bravinder seth z bravinder who drove the ambulance that transported floyd