Montana Title 50. Health and Safety § 50-30-205. Highly toxic defined

(a) produces death within 14 days in one-half or more of a group of 10 or more laboratory white rats each weighing between 200 and 300 grams at a single dose of 50 milligrams or less per kilogram of body weight when orally administered;

(b) produces death within 14 days in one-half or more of a group of 10 or more laboratory white rats each weighing between 200 and 300 grams when inhaled continuously for a period of 1 hour or less at an atmosphere concentration of 200 parts per million or less by volume of gas or vapor or 2 milligrams per liter or less by volume of mist or dust if that concentration is likely to be encountered by humans when the substance is used in a reasonably foreseeable manner; or

(c) produces death within 14 days in one-half or more of a group of 10 or more rabbits tested in a dosage of 200 milligrams or less per kilogram of body weight when administered by continuous contact with the bare skin for 24 hours or less.