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 senator is a person who works in the government. In the United States, senators are elected by voters to represent them in a state or federal senate. Each state in the US elects two senators who serve six-year terms in Washington, DC, where they pass laws and vote on policies. Other countries have senators as well, either elected or appointed. The word senator has been used in English since around 1200, from the Latin word, senex, or old man..