Penalty Group 4 consists of:
not more than 200 milligrams of codeine per 100 milliliters or per 100 grams;
not more than 100 milligrams of dihydrocodeine per 100 milliliters or per 100 grams;
not more than 100 milligrams of ethylmorphine per 100 milliliters or per 100 grams;
not more than 2.5 milligrams of diphenoxylate and not less than 25 micrograms of atropine sulfate per dosage unit;
not more than 15 milligrams of opium per 29.5729 milliliters or per 28.35 grams; and
not more than 0.5 milligram of difenoxin and not less than 25 micrograms of atropine sulfate per dosage unit;
Tex. Health and Safety Code § 481.105