; and (2) by adding at the end the following: (b) Waiver The Secretary may not grant any waiver or waiver modification that provides for the ability to perform mechanical or brake inspections of rail cars in Mexico in lieu of complying with the certification requirements of this section. . (b) Safety standards for certain rail crews (1) In general Title IV of division A of the Rail Safety Improvement Act of 2008 ( Public Law 110–432 ) is amended by adding at the end the following: 421. Safety standards for certain rail crews (a) In general The Secretary of Transportation may not permit covered rail employees to enter the United States to perform train or dispatching service unless the Secretary certifies that— (1) Mexico has adopted and is enforcing safety standards for covered rail employees that are equivalent to, or greater than, those applicable to railroad employees whose primary reporting point is in the United States, including qualification and certification requirements under parts 240 and 242 of title 49, Code of Federal Regulations; (2) covered rail employees are subject to the alcohol and drug testing requirements in part 219 of title 49, Code of Federal Regulations, including the requirements of subparts F, G, and H of such part, to the same extent as such requirements apply to railroad employees whose primary reporting point is in the United States and who are subject to such part; (3) covered rail employees are subject to hours of service requirements under section 21103 of title 49, United States Code, at all times any such employee is on duty, regardless of location; (4) covered rail employees are subject to the motor vehicle driving record evaluation requirements in section 240.115 of title 49, Code of Federal Regulations, to the same extent as such requirements apply to railroad employees whose primary reporting point is in the United States and are subject to such section, and that such evaluation includes driving records from the same country as the employee’s primary reporting point