Depends on what it is...if its narcotics and such, then we can charge at the federal level. When it comes to ADA, that is not something that we enforce in our department (we will respond and explain to the business owner if there is some sort of dispute). Its almost like building codes. Building codes are considered law, but its not enforced by the police. It would be enforced by Inspections and Permits (only using this as an example).
ADA law is enforced by several different agencies. Here is a list I have taken from DOL's website:
The Equal Employment Opportunity Commission enforces regulations covering employment. For information call 1-800-669-4000 Voice, 1-800-669-6820 TTY.
The Architectural and Transportation Barriers Compliance Board has the responsibility to issue minimum guidelines to ensure that buildings, facilities, and transit vehicles are accessible and usable by people with disabilities. For information call 202-872-2253 Voice, 1-800-993-2822 TTY
The Department of Transportation enforces regulations governing transit. For information call 1-888-446-4511 Voice; use relay service for TTY.
The Federal Communications Commission enforces regulations covering telecommunication services. For information call 1-888-225-5322 Voice/TTY.
The Department of Justice enforces regulations governing public accommodations and State and local government services. For information call 1-800-514-0301 Voice, 1-800-514-0383 TTY.