(a) A person commits an offense if the person intentionally conceals, cancels, defaces, obliterates, or damages another person's directive without that person's consent. An offense under this subsection is a Class A misdemeanor.
(b) A person is subject to prosecution for criminal homicide under Chapter 19, Penal Code, if the person, with the intent to cause life-sustaining treatment to be withheld or withdrawn from another person contrary to the other person's desires, falsifies or forges a directive or intentionally conceals or withholds personal knowledge of a revocation and thereby directly causes life-sustaining treatment to be withheld or withdrawn from the other person with the result that the other person's death is hastened.