Solomon–Lautenberg amendment
The Solomon–Lautenberg amendment is a U.S. federal law enacted in 1990 that urges states to suspend the driver's license of anyone who commits a drug offense. A number of states passed laws in the early 1990s seeking to comply with the amendment, in order to avoid a penalty of reduced federal highway funds.
Source: Wikipedia — Solomon–Lautenberg amendment (CC BY-SA 4.0)