Final answer:
Testing procedures in forensic science must meet the conditions of sensitivity and specificity to ensure accurate and exclusive identification of evidence.
Step-by-step explanation:
To permit positive identification, testing procedures used by forensic scientists must meet two key conditions: sensitivity and specificity. Sensitivity refers to the ability of the test to detect even minute levels of the target substance, which means a test with high sensitivity will have a low probability of producing a false negative result. In contrast, specificity refers to the test's ability to exclusively detect the target substance, avoiding cross-reaction with irrelevant substances, therefore a test with high specificity will have a low rate of false positives. In the context of forensics, this ensures that the evidence is accurately tied to the individual in question, without mistakenly implicating someone else.