A drug that is unlawful to possess or use is defined in the text ...

[storky111]

A drug that is unlawful to possess or use is defined in the text as
 
  A. an illicit drug.
  B. a narcotic.
  C. an addictive drug.
  D. an abused drug.

Question 2

It is obviously important for us to monitor which illicit drugs are widely used and whether their use is increasing or decreasing. Describe the most important sources of information we have about drug use in the United States and the major limitations of that kind of information.
 
  What will be an ideal response?

[SamMuagrove]

Answer to Question 1

A

Answer to Question 2

The Monitoring the Future study (large annual survey conducted in schools) and the National Survey on Drug Use and Health (household survey). Limitations are possible sample bias (those most at risk are less likely to be sampled), and uncertainty about the honesty of people's responses. Bonus: in spite of these limitations, year-by-year comparisons are useful for spotting increases or decreases.