This is taken from the California Game and Fish regulations. Some snakes have a bag limit. For instance Gopher snakes and Kingsnakes are 4...DAILY!!! And look for yourself, Rattlesnakes are unprotected altogether
§5.60. Reptiles.
(a) General Provisions: Only the following reptiles may be
taken under the authority of a sportfishing license, subject to the
restrictions in this section. The limit for each of the species listed
below is two, unless otherwise provided. Limit, as used in this
section, means daily bag and possession limit. No reptiles shall
be taken from ecological reserves designated by the commission
in Section 630 or from state parks, or national parks or monuments.
(b) No sportfishing license is required for the sport take of
any rattlesnake.