Final answer:
The claim that only the federal government can create laws about drug-impaired driving is false, as both state and federal governments have that power. The Necessary and Proper Clause actually expanded federal power, and states sometimes legislate independently on matters such as marijuana use.
Step-by-step explanation:
The statement that only the federal government can enact laws regarding drug-impaired driving is false. In the United States, both the federal government and state governments have the authority to enact laws related to driving under the influence of drugs. The Constitution's Necessary and Proper Clause has, contrary to the statement provided, expanded the power of the national government, not limited it. Furthermore, states have acted independently, such as in issues of marijuana legalization, exercising their own rights despite federal laws like the Controlled Substances Act (CSA).
Historically, states have also engaged in actions such as venue shopping and challenged federal authority through means like interposition or nullification, although courts have generally not been receptive to such actions unless the federal government was seen as overstepping its boundaries by directly requiring state and local officials to act.