Apr 96 Gen Co memo 96-5
"So long as the facts of a case satisfy the other requirements of section 212(h), you may properly interpret section 212(h) as giving you the authority to grant a waiver to an alien whose conviction was for the simple possession of 30 grams or less of any cannabis product that is within the definition found in 21 U.S.C. 802(16). Absent some unusual circumstances, however, we recommend that you limit your discretion in section 212(h) cases so that a section 212(h) waiver will be denied in most cases in which the alien possessed an amount of marijuana, other than leaves, that is the equivalent of more than 30 grams of marijuana leaves under the Federal Sentencing Guidelines, 18 U.S.C. App. 4."