Last night [a local administrator] instructed our officials that the sand bags out at [a soccer complex] which anchor the goals are not sufficient. Since these are the same sand bags used for Regionals, I am certain they would not have been used if they were not acceptable.
Can you please clarify?

USSF answer (September 6, 2010):
As we stated on March 15, 2006, this is a matter of player safety. There is no reason to look beyond Law 1. In describing the field and its appurtenances, Law 1 tells us, under “Goals”: “Goals must be anchored securely to the ground. Portable goals may only be used if they satisfy this requirement.” Using sand bags is one way of doing this, but even they present some danger. The decision can be made only by the referee on the spot.