In some cases, a title can also serve as a permanent legal record of condemnation of property, such as in the case of an automobile junk or salvage title. In the case of real estate, the legal instrument used to transfer title is the deed. A famous rule is that a thief cannot convey good title, so title searches are routine (or highly recommended) for purchases of many types of expensive property (especially real estate).
In contrast to most drugs that are chemically synthesized and their structure is known, most biologics are complex mixtures that are not easily identified or characterized. Biological products, including those manufactured by biotechnology, tend to be heat sensitive and susceptible to microbial contamination.
Currently, urine is the most commonly used biological substance in drug testing. Advantages of urine. sampling are that it is readily available, and standardized techniques for detecting drugs in urine exist. Other biological specimens e.g., blood, oral fluids, hair and sweat, can also be tested and may gain in.