Clarification

The lethal level of diphenhydramine found in Larry Isenberg’s body was 7,100 nanograms per milliliter, or ng/ml, according to information provided by detectives in a search warrant executed in Spokane County, where two of Lori Isenberg’s six children — Larry Isenberg’s stepchildren — live. Referred to as simply “nanograms” in most toxicolgy reports, it is a measurement of the concentration of a drug in a person’s system after it has metabolized. It is not a measurement of dosage. Normal therapeutic levels of diphenydramine are measured at a concentration of 100 to 1,000 nanograms per milliliter.