Is conducted, which If a positive result occurs for any drug, a

identifies exactly the toxin/drug present.

1) Confirmation test

2) Positive test

3) Negative test

4) Screening test

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products