"The provisions of this Paragraph shall not apply when the person committing the homicide is engaged, at the time of the homicide, in the acquisition of, the distribution of, or possession of, with intent to distribute a controlled dangerous substance in violation of the provisions of the Uniform Controlled Dangerous Substances Law."
Forgive a rookie for floundering around, but the way I read that paragraph, the buyer would need to buying with the intent to distribute. Different from buying for personal use.