"Some food businesses hesitate to donate food out of fear that, should the recipient become ill from the food, the donor could be held responsible. In 1988, the California legislature passed the “Russell Bill” which releases the donor from liability."
http://www.law.cornell.edu/uscode/text/42/1791
> "A person or gleaner shall not be subject to civil or criminal liability arising from the nature, age, packaging, or condition of apparently wholesome food or an apparently fit grocery product that the person or gleaner donates in good faith to a nonprofit organization for ultimate distribution to needy individuals."
This was passed by Bill Clinton to encourage food donation by protecting people from liabilities short of gross negligence.
From Wikipedia:
http://en.wikipedia.org/wiki/Bill_Emerson_Good_Samaritan_Act...