Police arrested a man with 2,673 pseudoephedrine pills at River City Casino on Aug. 7. Pseudoephedrine pills are a common ingredient used to make methamphetamine.
The suspect received the pills from a man in a white Mercedes and was taking them to another location to produce meth, St. Louis County Police said.
The Mercedes had a temporary license plate and was on the north lot of the casino.
The man's identity will be released when charges are issued.