; (19) diversion of marijuana into neighboring States and drug seizures in neighboring States; (20) marijuana plants grown on public lands in contravention to Federal and State laws; and (21) court filings under a State’s organized crime statutes. 16. Study on marijuana impairment (a) In general Not later than 1 year after the date of enactment of this Act, the Secretary of Transportation shall conduct a study on technologies and methods that law enforcement may use to determine whether a driver is impaired by marijuana. (b) Requirements The study conducted under subsection (a) shall be carried out by the National Highway Traffic Safety Administration, in consultation with any other agency the Secretary determines appropriate. (c) Authorization of appropriations There is authorized to be appropriated $10,000,000 to carry out this section. 17. Workplace impact of marijuana legalization study Not later than one year after the date of enactment of this Act, the National Institute for Occupational Safety and Health shall— (1) conduct a study and submit to Congress a report on the impact of the legalization of recreational cannabis by States on the workplace; and (2) develop best practices for use by employers that are transitioning their policies related to the use of recreational cannabis, prioritizing the development of best practices for employers engaged in Federal infrastructure projects, transportation, public safety, and national security. 18. School impact of marijuana legalization study Not later than one year after the date of enactment of this Act, the Secretary of Education shall— (1) conduct a study and submit to Congress a report on the impact of the legalization of recreational cannabis by States on schools and school-aged children; and (2) develop best practices for use by educators and administrators to protect school-aged children from any negative impacts of such legalization.