Yes, they will. They will also test your for steroids if you go to Wal-Mart, Red Lobster and the state of Maine.
However, since you are 18 and have no clue what you are doing, they will let you pass because you probably don't even look like you lift. Sorry, I know that sounds harsh, but using steroids at your age is stupid and careless.
Remember, stay out of Wal-Mart.