Four people face charges for their roles in a drug-smuggling scheme at the St. Landry Parish Jail, according to Sheriff Bobby Guidroz. Narcotics detectives conducted an undercover operation at the Racetrac Gas Station, located at 1018 E. Landry St. in Opelousas, after parish jail inmate Kirby Levier approached a corrections deputy and asked the deputy to assist him with bringing MOJO paper (synt…