Reports of 665 highway interdiction stops were received by the Maryland State Police's Criminal Intelligence Division over the 6-month period, a significant decrease over 920 stops reported in the first half of 1993. Overall, 1993 was a successful year for the highway interdiction effort. The police focus on Interstate 95 resulted in currency seizures ranging in value from $5,000 to over $30,000. Money was sometimes concealed in sophisticated false compartments or was simply placed in travel bags in the vehicle trunk. With the exception of heroin, the amount of seized drugs decreased from the same reporting period in 1992. Marijuana decreased slightly from 39.1 to 31 pounds, cocaine showed the sharpest drop from 28 to 2.8 pounds, and crack cocaine decreased from 10.7 to 5.5 pounds. The most highway interdiction stops were made on Tuesday, Wednesday, and Thursday, between midnight and 3:00 a.m. and between 9:00 a.m. and 6:00 p.m. Most people involved in highway interdiction stops did not reside in Maryland; many were residents of Virginia, North Carolina, and New York. With respect to nonhighway interdiction, most marijuana was seized at Baltimore/Washington International Airport. Cocaine was most frequently seized at train stations, while bus station interdictions were dominated by cocaine and crack cocaine. Brief descriptions of major highway seizures are provided. 9 tables and 4 figures