Delaware Code Title 16. Health and Safety § 4751D. Knowledge of weight or quantity not an element of the offense;  proof of weight or quantity

(a) In any prosecution under this subchapter, in which the weight or quantity of a controlled substance is an element of the offense, the State need not prove that the defendant had any knowledge as to the weight or quantity of the substance possessed.  The State need only prove that the defendant knew that the substance was possessed;  and, that the substance was that which is alleged, and that the substance weighed a certain amount or was in a certain quantity.

(b) In any prosecution under this subchapter, in which the quantity of a controlled substance is an element of the offense, and the controlled substance is alleged to be a “prescription drug” as defined in § 4701 of this title, and the alleged prescription drug consists of multiple doses that appear to be substantially identical, evidence that a chemist or other qualified witness properly tested one dose, and found the presence of a controlled substance, shall be prima facie evidence that the “substantially identical doses” each contained the controlled substance that is a prescription drug for purposes of determining whether the State has proven the number of doses constituting the Tier quantities set forth in § 4751C(2)j. or (3)j. of this title.  Nothing in this subsection precludes the right of any party to introduce any evidence supporting or contradicting evidence offered pursuant to this subsection.

(c) The identity or composition of a controlled substance, or a mixture containing a controlled substance, may be established by utilizing a hypergeometric sampling plan or other scientifically accepted methodology.