 They argued that the evidence was 'compromised' during the collection phase of evidence gathering by mishandling and 100% of the "Real Killer(s)" DNA was lost, and then 'contaminated' during the processing phase with Simpsons preserved DNA being transferred to all but three exhibits.The remaining three were 'corrupted' as they allege that the police planted that blood evidence.Due to its abundance and exhaustive validation, the prosecution considered the DNA evidence infallible.