How will I know if a 2003 $1 bill is real?
It is longer than usual and thicker
its probably real because no one would take the time to counterfeit 1 single dollar. but, soak it in water, if the ink runs then its fake.
You can take it to a bank or foreign exchange bureau to have them determine whether the bill is phony or not by checking the serial number. A fake bill is normally made with bleach, which looks like a mixture of cotton or linen.
Go spend it.