CA Food & Agric Code Section 13191

(a)

No person, except a pest control dealer licensed pursuant to Chapter 7 (commencing with Section 12101) of Division 6 of the Food and Agricultural Code, may sell a pesticide that contains the active ingredient clopyralid.

(b)

Pesticides containing the active ingredient clopyralid that are labeled for use on lawns and turf, including golf courses, may only be sold to qualified applicators licensed pursuant to Chapter 8(commencing with Section 12201) of Division 6 of the Food and Agricultural Code or issued a certificate pursuant to Chapter 3 (commencing with Section 14151) of Division 7 of the Food and Agricultural Code.