For this reason, pre-employment screening test could be used (Wikipedia 2008). In this method, all individuals enrolling in the military would be required to test prior to their enrollment for drug screening, and persons with positive test results would be barred from entering the military. All individuals would be tested once before the enrollment. Followed by this screening, a post-incident screening method (Wikipedia 2008) could be used to determine drug presence in the individual after an incident has taken place, or only when an individual is suspected of drug intoxication. On-site screening would have to be followed by lab conformation tests (Wikipedia 2008) for the purpose of legitimacy. The number of such screenings depends upon and would be restricted only to the number of incidences occurred and the number of individuals involved in those incidences.