A commercial driver's license (CDL) is a driver's license required in the United States to operate any type of vehicle. 1  weighing 26,001 pounds or greater, or any combination of vehicles weighing 26,001 pounds or greater when towing a trailer weighing more than 10,000 pounds.
The cause of drug abuse is not fully known but likely include genetic predisposition, co-occurring conditions and environmental circumstances. Drug use and experimentation is common in pre-adolescents and adolescents, but only a small percentage of those users will go on to abuse drugs.hile many people use drugs, only a small percentage abuse drugs, but it has been noted drug abuse often runs in families, suggesting genetics is one of the causes of drug abuse.
Social risk factors for drug abuse and addiction include male gender, being between 18 and 44 years of age, Native-American heritage, unmarried marital status, and lower socioeconomic status.According to statistics by state, people residing in the West tend to be at higher risk for chemical abuse or dependency.ocial risk factors for drug abuse and addiction include male gender, being between 18 and 44 years of age, Native-American heritage, unmarried marital status, and lower socioeconomic status.