For example, a 5 panel drug test checks for 5 drugs, while a 10 panel drug screen checks for 10 drugs. A standard 5 panel drug urine test is the drug test most frequently used by government agencies and private employers.
While a member of the senate is called a senator, a representative is simply called a congressman or a congresswoman. However, collectively, both senators and representatives are also referred to as congressmen. The word Senate comes from the Latin word senate meaning old man.
A United States senator is an elected official serving in the senate, which is part of the United States Congress. Senators are elected for six year terms. They're assigned to serve on committees in which they review proposed laws, called bills. Each committee focuses on a different topic, such as budget, defense, health etc. Once a bill is passed in committee, senators must vote on the bill. If it's passed, the bill becomes law [source: Education].