Discuss the Presumptive testing for saliva

When presented with possible saliva, urine, or fecal stains and asked to confirm, many forensic labs these days are unwilling or unable to do so. There are myriad reasons for this. Based on what you have learned so far in this course, what do you think are the rationale for not supporting these tests? Consider the wide view of the costs, accreditation, the legal system, and the “benefit-add” or “return on investment (ROI)” from performing these tests.