Check for Understanding VI - Presumptive Tests &Extraction Methods Toxicology 8 Controlled Substances 4 of 5 Which of the following layers contains all the blood components which are extracted before analyzing the drugs? Concentrated layer Aqueous layer Partition layer Organic layer

## Step 1<br />The problem is about toxicology and controlled substances, specifically about the extraction methods used in toxicology. The question asks which layer contains all the blood components that are extracted before analyzing the drugs.<br /><br />## Step 2<br />The options provided are: Concentrated layer, Aqueous layer, Partition layer, and Organic layer. <br /><br />## Step 3<br />In the context of toxicology, the aqueous layer is the layer that contains all the blood components. This is because the aqueous layer is the layer that is in direct contact with the blood sample, and it is where the blood components are extracted before analyzing the drugs.