Personal possession limits and transaction limits are detailed in RCW 69.50.360 and 69.50.4013.

(1) For persons age twenty-one and older and qualifying patients or designated providers who are not entered into the medical marijuana authorization database, marijuana serving and transaction limitations are as follows:

(a) Single serving. A single serving of a marijuana-infused product must not exceed ten milligrams active tetrahydrocannabinol (THC), or Delta 9.

(b) Maximum number of servings. The maximum number of servings in any one single unit of marijuana-infused product meant to be eaten or swallowed or otherwise taken into the body is ten servings or one hundred milligrams of active THC, or Delta 9. A single unit of marijuana concentrate cannot exceed one gram.

(c) Transaction limits.

(i) A single transaction is limited to:

(A) One ounce of useable marijuana;

(B) Sixteen ounces of marijuana-infused product meant to be eaten or swallowed in solid form;

(C) Seven grams of marijuana-infused extract or marijuana concentrate for inhalation; and

(D) Seventy-two ounces of marijuana-infused product in liquid form for oral ingestion or applied topically to the skin; and

(E) Ten units of a marijuana-infused product otherwise taken into the body.

(ii) A licensee or employee of a licensee is prohibited from conducting a transaction that facilitates an individual in obtaining more than the personal possession amount.

(2) For qualifying patients and designated providers who are entered into the medical marijuana authorization database, serving and transaction limits are as follows:

(a) Single serving. Except as provided in chapter 246-70 WAC, a single serving of a marijuana-infused product must not exceed ten milligrams active tetrahydrocannabinol (THC), or Delta 9.

(b) Maximum number of servings. Except as provided in chapter 246-70 WAC, the maximum number of servings in any one single unit of marijuana-infused product meant to be eaten, swallowed or applied is ten servings or one hundred milligrams of active THC, or Delta 9. A single unit of marijuana concentrate cannot exceed one gram.

(c) Transaction limitation. A single transaction by a retail store with a medical marijuana endorsement to a qualifying patient or designated provider who is entered into the medical marijuana database is limited to three ounces of useable marijuana, forty-eight ounces of marijuana-infused product meant to be eaten or swallowed in solid form, twenty-one grams of marijuana-infused extract or marijuana concentrate for inhalation, and two hundred sixteen ounces of marijuana-infused product in liquid form meant to be eaten or swallowed.