No, an employer may accept a negative/dilute test result as a negative test. If the employer wants a retest it may do so, however, it must be stated in the employer's policy and the employer must require a retest of all individuals that have a negative/dilute result in the same testing category.
Alcohol affects activity of such neurotransmitters as glutamate, GABA, and dopamine; caffeine blocks the action of the neurotransmitter adenosine. Such changes are studied in the field of psychopharamacology, which concerns the effects of drugs on the mind and brain. This field investigates both recreational drugs such as alcohol, caffeine, marijuana, cocaine, and LSD, and therapeutic drugs such as antidepressants and antipsychotics.
Marijuana Effects-Brain Effects of Marijuana. It was not until the 1990s that cannabinoid receptors in the brain, responding to THC, were discovered. Marijuana affects the brain primarily through these cannabinoid receptors, known as CB1 and CB2.CB1 receptors are found, primarily, throughout the brain.Through THC's interaction with CB1, marijuana effects brain areas relating to higher functioning, memory, cognition, movement and brain reward. CB1 receptors are also responsible for brain effects of marijuana involving:ver 400 active compounds have been found in the cannabis plant, 60 of which are unique to marijuana. The chemical compounds found in cannabis are collectively known as cannabinoids. Marijuana affects the brain primarily through the psychoactive compound delta-9-tetrahydrocannanbinol (THC), referred to as THC.