Forensic Toxicology Blog
Evidence-based articles about toxicology, expert testimony, legal developments, alcohol, drugs, and forensic testing.
Two Protective Preconditioning Methods Used Different Cannabinoid-Related Mechanisms in Rat Brain Slices
NMDA and DHPG preconditioning both reduced vulnerability to later injury in rat hippocampal slices, but CB1 blockade disrupted only the DHPG-related protection. Similar protective outcomes did not establish a shared mechanism. The preparation was an organotypic slice The investigators used rat hippocampal tissue and experimental excitotoxic or oxygen-and-glucose-deprivation insults. The…
Median-Nerve Stimulation Retained Efficacy in Morphine-Tolerant Mice Without Demonstrating Reversal of Morphine Tolerance
Median-nerve stimulation reduced mechanical allodynia in morphine-tolerant mice through an orexin- and CB1-related mechanism. Retaining the stimulation effect does not itself demonstrate restoration of the response to morphine. The intervention was electrical stimulation The study tested stimulation at a median-nerve-associated location after experimental nerve injury. Stimulation at a different location…
PMSF’s Morphine-Tolerance Findings Did Not Track Withdrawal and Oxidative Markers Identically
An experimental FAAH inhibitor reduced morphine tolerance under acute and chronic procedures in mice, while withdrawal and oxidative-stress findings improved with chronic administration. Different endpoints did not follow one interchangeable response pattern. The chosen dose was below its own antinociceptive effect The investigators identified PMSF doses producing antinociception and selected…
A Historical Marijuana-Dependence Study Found Some Diagnosed Participants Reported Neither Tolerance Nor Withdrawal
A historical interview study found that some participants with a lifetime marijuana-dependence diagnosis reported neither tolerance nor withdrawal. Those physiological histories distinguished clinical subgroups, rather than serving as interchangeable definitions of the entire disorder. The study began with diagnosed participants Structured interviews identified people meeting a lifetime dependence diagnosis for…
THC Retained Antinociceptive Activity Without Morphine Cross-Tolerance in a Rat Pathological-Pain Model
In a rat pathological-pain experiment, THC remained antinociceptive and did not show cross-tolerance with morphine on the tested effects. The finding is specific to the pain state and procedure, rather than a universal cannabinoid–opioid rule. The study examined an altered pain state The authors investigated THC-related antinociception in rats with…
Oleamide’s Cannabinoid-Like Behavior Involved More Than a Simple CB1 Explanation
Oleamide produced several cannabinoid-like effects in rats, but pharmacological probes implicated GABAergic and dopaminergic systems as well. Similar behavior did not establish a single CB1-mediated mechanism. The behavioral pattern was incomplete Oleamide reduced movement and produced analgesia and hypothermia, but did not cause catalepsy. At a dose without motor effects,…
OEA’s Relationship to Anandamide Did Not Make Its Feeding Effect Cannabinoid-Receptor Activation
Oleylethanolamide is structurally related to anandamide, but the supplied study reported that it does not activate cannabinoid receptors. Its feeding effects in rats therefore should not be described as another demonstration of THC-like receptor action. Related lipids can have different targets The study described stimulus-dependent OEA production and rapid enzymatic…
The RIO-Diabetes Weight-Loss Result Requires Its Randomized Population and Follow-Up Context
A randomized rimonabant trial reported greater average weight loss than placebo, but not every participant completed one year. The result should retain its intention-to-treat analysis and accompanying diet-and-activity intervention. The intervention was CB1 blockade The trial studied a cannabinoid-receptor blocker in overweight or obese adults with type 2 diabetes inadequately…
Cannabinoid Co-Detection in Methadone Fatalities Did Not Establish Its Contribution to Death
Cannabinoids were among the substances detected in a medical-examiner series of methadone toxicity fatalities. Their presence did not, by itself, establish that cannabis caused or materially contributed to any particular death. The case series began with methadone-related deaths Investigators reviewed fatalities attributed to methadone toxicity and recorded additional toxicological findings….
Parallel Marijuana, Smoking and Drinking Trajectories Did Not Establish a Gateway Sequence
A large panel study found parallel developmental patterns in marijuana use, smoking and heavy drinking during young adulthood. Such co-occurrence can reflect shared vulnerability and timing, rather than proving that one substance caused later use of another. The study followed developmental courses Four waves of data spanning ages eighteen to…
Prior Marijuana Use Was Associated With Nicotine Reward, Not Broad Nicotine Cross-Tolerance
A study of young adult nonsmokers linked prior marijuana use with greater nicotine reward, but did not find a broad pattern of altered initial nicotine sensitivity. An association in selected outcomes is not proof that marijuana caused nicotine dependence. Controlled nicotine exposure followed an observational history Participants received different nasal-spray…
Nantradol’s Shock-Titration Effect in Monkeys Was Entangled With Disrupted Responding
In a squirrel-monkey experiment, higher shock intensity after nantradol occurred mainly at doses that severely disrupted responding. That makes the behavioral procedure essential to interpreting the apparent pain-related effect. Responses controlled the shock level Lever pressing decreased shock intensity, which otherwise increased over time. A drug-induced rise in tolerated or…
