Originally Posted by
GUWonder
They are required to be in possession of the permanent residency card, but that doesn't necessarily mean they have to carry their card on person at all times when in the US.
Actually, the law does say it has to be carried at all times.
http://www.uscis.gov/ilink/docView/S...-0-0-8289.html
(e) Every alien, eighteen years of age and over,
shall at all times carry with him and have in his personal possession any certificate of alien registration or alien registration receipt card issued to him pursuant to subsection (d). Any alien who fails to comply with the provisions of this subsection shall be guilty of a misdemeanor and shall upon conviction for each offense be fined not to exceed $100 or be imprisoned not more than thirty days, or both.