USA Banner

Official US Government Icon

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure Site Icon

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

U.S. Department of Transportation U.S. Department of Transportation Icon United States Department of Transportation United States Department of Transportation

Drug Interdiction Assistance Program

Established in 1988, FMCSA’s Drug Interdiction Assistance Program (DIAP) assists law enforcement officials in detecting and apprehending transporters and/or users of illicit drugs involving a commercial motor vehicle (CMV). The program focuses on the development and distribution of criminal interdiction techniques to rapidly identify in-transit CMVs and drivers engaged in criminal activity.

Since inception, DIAP team members have trained approximately 170,000 Federal, State, and local officials in CMV drug and criminal interdiction tactics and techniques. National studies and surveys have shown that illicit drug seizures, impaired driver arrests, and criminal apprehensions routinely increase substantially after DIAP training.

Our Training

DIAP training includes all training materials, delivered by certified instructors, tailored to meet your agency’s specific needs. Training is provided to law enforcement agencies free of charge, there is no instructor honorarium or any other fee associated with approved training.

Our Services

Along with training, we offer the following support:

  • Investigative/information requests 
  • Consulting on transportation security initiatives
  • Integrating effective technology
  • Advice on discretionary funding 
  • Technical assistance 

Ready to Apply?

Download, complete, and submit the DIAP Training Request form and return it to the DIAP Office via mail (see form for address) or email the complete form to

Need more information?

Contact the NTC