-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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 8+0RW8iDUNOh+lWCRQxEIg==

<SEC-DOCUMENT>0001140361-03-001720.txt : 20030527
<SEC-HEADER>0001140361-03-001720.hdr.sgml : 20030526
<ACCEPTANCE-DATETIME>20030527151826
ACCESSION NUMBER:		0001140361-03-001720
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20030523
FILED AS OF DATE:		20030527

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			LANGLEY RICK
		CENTRAL INDEX KEY:			0001215323

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	002-90539
		FILM NUMBER:		03719881

	BUSINESS ADDRESS:	
		STREET 1:		8233 ROXBURY ROAD
		CITY:			LOS ANGLES
		STATE:			CA
		ZIP:			90069
		BUSINESS PHONE:		3104338289

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			APPLIED DNA SCIENCES INC
		CENTRAL INDEX KEY:			0000744452
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-COMPUTER PROCESSING & DATA PREPARATION [7374]
		IRS NUMBER:				592262718
		STATE OF INCORPORATION:			NV
		FISCAL YEAR END:			0930

	BUSINESS ADDRESS:	
		STREET 1:		211 WEST WALL
		CITY:			MIDLAND
		STATE:			TX
		ZIP:			79701
		BUSINESS PHONE:		9156821761

	MAIL ADDRESS:	
		STREET 1:		211 WEST WALL
		CITY:			MIDLAND
		STATE:			TX
		ZIP:			79701

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	PROHEALTH MEDICAL TECHNOLOGIES INC
		DATE OF NAME CHANGE:	20010504

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	DCC ACQUISITION CORP
		DATE OF NAME CHANGE:	19990211

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	DATALINK CAPITAL CORP/TX/
		DATE OF NAME CHANGE:	19980306
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>doc1.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>
    <schemaVersion>X0101</schemaVersion>

    <documentType>4</documentType>
<periodOfReport>2003-05-23</periodOfReport>
<notSubjectToSection16>0</notSubjectToSection16>
    <issuer>
        <issuerCik>0000744452</issuerCik>
        <issuerName>APPLIED DNA SCIENCES INC</issuerName>
        <issuerTradingSymbol>APDN</issuerTradingSymbol>
</issuer>
<reportingOwner>
<reportingOwnerId>
            <rptOwnerCik>0001215323</rptOwnerCik>
            <rptOwnerName>LANGLEY RICK</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>  </rptOwnerStreet1>
            <rptOwnerStreet2>  </rptOwnerStreet2>
            <rptOwnerCity>  </rptOwnerCity>
            <rptOwnerState>  </rptOwnerState>
            <rptOwnerZipCode>  </rptOwnerZipCode>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
<isDirector>0</isDirector>
<isOfficer>0</isOfficer>
<isTenPercentOwner>1</isTenPercentOwner>
<isOther>0</isOther>
<officerTitle></officerTitle>
<otherText></otherText>
</reportingOwnerRelationship>
</reportingOwner>
<nonDerivativeSecurity>
<securityTitle>
<value>Common Stock</value>
</securityTitle>
<transactionDate>
<value>2003-05-23</value>
</transactionDate>
<transactionCoding>
<transactionFormType>4</transactionFormType>
<transactionCode>D</transactionCode>
<equitySwapInvolved>0</equitySwapInvolved>
</transactionCoding>
<transactionTimeliness>
<value></value>
</transactionTimeliness>
<transactionAmounts>
<transactionShares>
<value>25000</value>
<footnoteId id="F1"/>
</transactionShares>
<transactionValue>
<value>2.50</value>
<footnoteId id="F2"/>
</transactionValue>
<transactionAcquiredDisposedCode>
<value>A</value>
</transactionAcquiredDisposedCode>
</transactionAmounts>
<postTransactionAmounts>
<sharesOwnedFollowingTransaction>
<value>117000</value>
<footnoteId id="F3"/>
</sharesOwnedFollowingTransaction>
</postTransactionAmounts>
<ownershipNature>
<directOrIndirectOwnership>
<value>D</value>
</directOrIndirectOwnership>
<natureOfOwnership>
<value></value>
</natureOfOwnership>
</ownershipNature>
</nonDerivativeSecurity>
<footnotes>
<footnote id="F1">A total of 160,000 shares were issued to Rick Langley from the Professional/Employee/Consultant Compensation Plan sponsored by the Issuer, and filed with the SEC in an S-8 Registration Statement.  Such shares were issued in lieu of cash payments for services and for expenses incurred previously.  That acquisition of Issuer shares by Rick Langley, therefore, was exempt from Section 16(b) of the Securities Exchange Act of 1934 under Rule 16b-3(a), and no Form 4 disclosure was required for that acquisition of shares. This Form is being filed voluntarily, in advance, for the sale of up to 25,000 over the next 30-60 days, in accordance with the Form 4 instructions.</footnote>
<footnote id="F2">The estimated price per share is $2.50, but future prices may be variable.</footnote>
<footnote id="F3">This number is the actual number of shares held by Rick Langley after the sale of 25,000 shares.  Additionally, however, Rick Langley has an indirect interest in shares held in RHM Management, Inc., of which Rick Langley is President and the majority shareholder.  RHM Management, Inc. ceased to be an affiliate of the Issuer on March 21, 2003, and now holds only 400,000 shares of Common Stock of the Issuer.</footnote>
</footnotes>
<ownerSignature>
<signatureName>Rick Langley</signatureName>
<signatureDate>2003-05-23</signatureDate>
</ownerSignature>
</ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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