Are online or instant ESA letters legal in California?

What the law says

Cal. Health & Safety Code § 122319(a)(2) requires an established client-provider relationship of at least 30 days before a clinician provides ESA documentation.

Source: Cal. Health & Safety Code § 122319 ↗

In plain language

Because California requires a California-licensed clinician and a client-provider relationship of at least 30 days, an "instant" or same-day online ESA letter — issued after a single questionnaire with no established clinical relationship — generally does not meet California's statutory requirements. Telehealth itself is permitted: a California-licensed clinician can establish the required relationship and evaluate a patient by video or phone. What the statute targets is the absence of a genuine, durable clinical relationship, not the online format. Whether a specific online service satisfies California law depends on the clinician's licensure and the length and nature of the relationship, which is a question for a California-licensed attorney.