Exhibit 31.1

CERTIFICATION

I, James A. Hayward, certify that:

1. I have reviewed this Amendment No. 1 to Annual Report on Form 10-K of Applied DNA Sciences, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

Date: December 16, 2019

/s/ James A. Hayward

James A. Hayward

President, Chief Executive Officer and Chairman

(Principal Executive Officer)