Final answer:
The provided reference material does not give a clear answer about the percent of adults who use illegal drugs and are employed. For accurate information, directly consult the U.S. Department of Labor or similar authoritative sources.
Step-by-step explanation:
The question asked does not provide sufficient information to determine the percent of adults who use illegal drugs that are employed, as it is not supported by the provided reference material. The reference material does discuss employment rates and labor force participation but does not specify statistics related to drug use among the employed