Repeatibility test Sample positif Witness positif, DNA present Witness negatif, just mix PCR without DNA Witness negative, just H2O Contamination test Sample positif Sample negatif Witness positif, DNA present Witness neg, just mix PCR without DNA Witness negative, just H2O Linearity test, limit detection Sample positif Witness positif, DNA present Witness negative, just H2O Witness negative, just H2O Sample posit dilution 1 Sample posit dilution 10^-1 Sample posit dilution 10^-2 Sample posit dilution 10^-3 Sample posit dilution 10^-4 Sample posit dilution 10^-5