Section 162, act Aug. 20, 1912, ch. 308, 9, 37 Stat. 318, authorized rules and regulations as necessary for carrying out the purposes of this chapter. Section 163, acts Aug. 20, 1912, ch. 308, 10, 37 Stat. 318; Pub. L. 97–461, § 2, Jan. 12, 1983, 96 Stat. 2523, set forth penalties for violations of provisions of this chapter or regulations promulgated thereunder. Section 164, act Aug. 20, 1912, ch. 308, 10, 37 Stat. 318, set forth duty of United States attorneys to prosecute violations of this chapter. Section 164a, act Aug. 20, 1912, ch. 308, 10, as added May 1, 1928, ch. 462, 45 Stat. 468, authorized search and seizure of nursery stock and plant products by Department of Agriculture employees.