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Water if ingested in large enough quantities can cause death, and no I'm not talking about drowning. So can several vitamins that are required for life. In that study regarding liver damage did you notice the dosage the mice were given?
From the forbes cite:
First, researchers utilized all of the dosage and safety recommendations from a CBD-based drug known as Epidiolex. If this name sounds familiar, it should. Last year, the U.S. Food and Drug Administration approved it as a treatment for certain kinds of childhood epilepsy. It was a development that marked the first time in history that a cannabis-based medicine was approved for nationwide distribution in the United States.
Researchers then spent some time examining mice under the influence of various doses of CBD. Some of the animals received lower doses, while others were given more. The dosage is said to have been "the allometrically scaled mouse equivalent doses (MED) of the maximum recommended human maintenance dose of CBD in EPIDIOLEX (20 mg/kg)."
Shockingly, researchers discovered that the mice given higher doses of CBD showed signs of liver damage within 24 hours. To that end, 75 percent of these animals in the sub-acute phase had either died or were on the verge of death within a few days.
From Journal of Basic and Clinical Pharmacy, a publication of National Center for Biotechnology Information (NCBI)
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4804402/
A simple practice guide for dose conversion between animals and human
Allometric scaling is an empirical approach where the exchange of drug dose is based on normalization of dose to body surface area. This approach assumes that there are some unique characteristics on anatomical, physiological, and biochemical process among species, and the possible difference in pharmacokinetics/physiological time is accounted by allometric scaling.[5,6] This method is frequently used in research for experimental purpose to predict an approximate dose on the basis of data existing in other species. Drugs with lesser hepatic metabolism, low volume of distribution, and excreted by renal route are ideal candidates for scaling of dose by this approach.
"Hepatic" refers to liver and liver function. Please do let me know your precise scientific objections to the study methodology