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.
There is not any single fact which causes child abuse; abuse usually occurs in families where there is a combination of risk factors. Abuse and neglect occur most often in families who are under pressure and lack support.ost abuse other than sexual abuse occurs in families to which some, or all, of the following apply: 1  Poverty. 2  Lack of education. 3  Serious marital problems. 4  Frequent changes of addresses. 5  Violence between family members. 6  Lack of support from the extended family. 7  Loneliness and social isolation. 8  Unemployment.