On January 8, 2011, the California Office of Environmental Health Hazard Assessment (OEHHA) issued a notice of proposed rulemaking aimed at amending the regulations governing the short-form warning under Proposition 65. The deadline for submitting comments in response to this notice is March 8, 2021.

In 2016, OEHHA adopted new Article 6 Clear and Reasonable Warning regulations which became operative in August 2018.  Among other changes, the regulations provided for a short-form warning which allowed for an abbreviated product warning in certain circumstances. If a company used the short form, it was not required to list the name of the chemical that created the risk. So until now the following warning was sufficient:

WARNING: Cancer and reproductive harm- www.P65Warnings.ca.gov