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.
Causes of Child Abuse. The causes of child abuse are multi-faceted and can't be narrowed down to a single cause. Oftentimes, there are multiple factors at play. For instance, a father may be an alcoholic and part of a family system that is caught up in a cycle of abuse that spans generations of the family.amily income level. The U.S. government's Third National Incidence Study of Child Abuse and Neglect (NIS-3) found that compared to families with incomes over $30,000 a year, children in families with incomes less than $15,000 a year: 1  were almost 14 times more likely to be harmed by some variety of abuse.