(a) Except as authorized by this chapter, a person commits an offense if the person knowingly or intentionally possesses a usable quantity of marihuana.

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(b) An offense under Subsection (a) is:

(1) a Class B misdemeanor if the amount of marihuana possessed is two ounces or less;

(2) a Class A misdemeanor if the amount of marihuana possessed is four ounces or less but more than two ounces;

(3) a state jail felony if the amount of marihuana possessed is five pounds or less but more than four ounces;

(4) a felony of the third degree if the amount of marihuana possessed is 50 pounds or less but more than 5 pounds;

(5) a felony of the second degree if the amount of marihuana possessed is 2,000 pounds or less but more than 50 pounds;  and

(6) punishable by imprisonment in the Texas Department of Criminal Justice for life or for a term of not more than 99 years or less than 5 years, and a fine not to exceed $50,000, if the amount of marihuana possessed is more than 2,000 pounds.