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

(1) For persons age 21 and older and qualifying patients or designated providers who are not entered into the medical cannabis authorization database, cannabis serving and transaction limitations are as follows:

(a) Single serving. A single serving of a cannabis-infused product must not exceed 10 milligrams active tetrahydrocannabinol (THC), or Delta 9.

(b) Maximum number of servings. The maximum number of servings in any one single unit of cannabis-infused product meant to be eaten or swallowed or otherwise taken into the body is 10 servings or 100 milligrams of active THC, or Delta 9. A single unit of cannabis concentrate cannot exceed one gram.

(c) Transaction limits.

(i) A single transaction is limited to:

(A) One ounce of useable cannabis;

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

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

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

(E) Ten units of a cannabis-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 cannabis 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 cannabis-infused product must not exceed 10 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 cannabis-infused product meant to be eaten, swallowed or applied is 10 servings or 100 milligrams of active THC, or Delta 9. A single unit of cannabis concentrate cannot exceed one gram.

(c) Transaction limitation. A single transaction by a retail store with a medical cannabis endorsement to a qualifying patient or designated provider who is entered into the medical cannabis database is limited to three ounces of useable cannabis, 48 ounces of cannabis-infused product meant to be eaten or swallowed in solid form, 21 grams of cannabis-infused extract or cannabis concentrate for inhalation, and 216 ounces of cannabis-infused product in liquid form meant to be eaten or swallowed.