 In the film, Popeye, Cloudy, and BNDD (Federal Bureau of Narcotics  and Dangerous Drugs, forerunner of the DEA) Agent Bill Mulderig  stake out Chaniers Lincoln Continental (the cases "dirty" car)  after seeing Sal Boca drive it to a side street; the stakeout lasts  until 4:10 AM the next morning. In the actual French Connection case  the stakeout of Frog Ones car lasted three days.