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.
Long-term Cannabis Use. Studies have linked the long-term abuse of substances such as alcohol, cocaine and heroin with a decrease in the brainâs overall production and release of dopamine. This is because most drugs cause damage to brain cells that produce dopamine.Cannabis users can breathe easy, however, as cannabinoids are believed to have the opposite effect. Likewise, a study published in 2012 found that long-term cannabis consumption does not result in permanent changes in dopamine levels.hese chemicals are used by the brain to transmit signals. Dopamine can affect mood and attention. But dopamine is not just any neurotransmitter. Dopamine is known as the âfeel goodâ neurotransmitter because of its role in feelings of happiness and pleasure.