Under this grant, many extraction techniques will be examined for use. The proposed plan is to assess liquid/liquid, solid/liquid, and QuEChERS extraction techniques. The extraction techniques used will be optimized for use on a gas chromatograph (GC) with flame ionization detector (FID). The development of quantitation methods will focus on the five types of samples routinely submitted to the Denver Crime Laboratory, i.e., baked goods, chocolates, candies, tinctures, and beverages. The project has the following objectives: 1) Identify the best method for sample preparation for each of five types of food products currently encountered; 2) Determine the best practice extraction technique for each of the five types of food products; 3) For each of the five food types, determine the extraction technique that will result in at least 80-percent recovery of THC, with a goal of greater than 90 percent; and 4) Create a standard operating procedure that is quick, safe, reliable, and low cost.