Exhibit 32.1

CERTIFICATION PURSUANT TO

U.S.C. SECTION 1350

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

I, Brian Hullinger, Chief Executive Officer and President of Psychemedics Corporation (the “Company”), certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, as the principal executive officer of the Company, that:

(1) The Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2023, as filed with the Securities and Exchange Commission on November 13, 2023 (the “Report”), fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date:   November 13, 2023	/s/ Brian Hullinger
	Brian Hullinger
	Chief Executive Officer and President
	(principal executive officer)