DNA authentication

A method for determining whether or not the sequence of a test DNA molecule and the sequence of a reference DNA molecule are 95 to 100% identical, comprising the steps of:

• a) preparing (11) a first solution of single stranded test DNA molecules;
• b) attaching a reference DNA molecule (13) to a solid support to form a solid support-reference DNA complex;
• c) hybridizing (14) said single stranded test DNA molecules with said solid support-reference DNA complex to form a solid support-reference DNA-test DNA complex wherein said solid support-reference DNA-test DNA complex is formed when the reference DNA and the test DNA sequences are 95 to 100% identical;
• d) filtering (15) said solid support-reference DNA-test DNA complex through a filter under conditions such that said test DNA molecules pass through said filter into a filtered solution if said test DNA has not hybridized to said reference DNA;
• e) adding a solvent (16) to said filtered solution to form solvent treated filtered solution;
• f) detecting (18) the presence or absence of said test DNA in said solvent treated filtered solution by measuring the opacity or turbidity or said solvent treated filtered solution wherein the presence of DNA is said filtered solution indicates that the sequences of the test and reference DNA samples were less than 95% identical and wherein the absence of DNA is said filtered solution indicates that the sequences of the test and reference DNA samples were more than 95% identical.