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.
How drugs affect people depends on lots of things: the kind of drug taken; how much is taken; how often someone uses it; how quickly it gets to the brain; what other drugs, food, or substances are taken at the same time; the person's body size, shape, and chemistry; Although substances can feel good at first, they can do a lot of harm to the body and brain. Drinking alcohol, smoking or using tobacco, taking illegal drugs, even sniffing glue all damage the human body.