CA Pub Cont Code Section 10295.4

(a)

Notwithstanding any other law, a state agency shall not enter into any contract for the acquisition of goods or services with a contractor whose name appears on either list of the 500 largest tax delinquencies pursuant to Section 7063 or 19195 of the Revenue and Taxation Code. Any contract entered into in violation of this subdivision is void and unenforceable.

(b)

This section shall apply to any contract executed on or after July 1, 2012.