The rise of DNA evidence to the forefront of forensic science has led to high sample numbers being
submitted for profiling by investigators to casework laboratories: bottleneck effects are often seen
resulting in slow turnaround times and sample backlog. The ParaDNA1 Screening and Intelligence Tests
have been designed to guide investigators on the viability of potential sources of DNA allowing them to
determine which samples should be sent for full DNA analysis. Both tests are designed to augment the
arsenal of available forensic tests for end users and be used concurrently to those commonly available.
Therefore, assessing the impact that common forensic tests have on such novel technology is important
to measure. The systems were tested against various potential inhibitors to which samples may be
exposed as part of the investigative process. Presumptive test agents for biological materials (blood,
semen and saliva) and those used as
fingerprint enhancement agents were both used. The Screening Test
showed a drop in performance following application of aluminium powder and cyanoacrylate (CNA) on
fingerprints samples; however this drop in performance was not replicated with high template DNA. No
significant effect was observed for any agent using the Intelligence Test. Therefore, both tests stand up
well to the chemical agents applied and can be used by investigators with confidence that system
performance will be maintained.