Which of the following is an example of high lethality suicide methods?

The use of a gun is classified as a high lethality suicide method because it typically results in a high fatality rate due to the immediate and lethal nature of the injury inflicted. Firearms are often associated with impulsive suicide attempts, and the chances of survival following such events are significantly low. This method leaves little time for intervention, which further increases its lethality.

In contrast, wrist cutting and nonprescription drug overdoses generally have lower lethality rates. While these methods can potentially be fatal, they are not as consistently lethal as the use of firearms. Overdoses of barbiturates can be more lethal than nonprescription drugs, but the chances of survival increase with prompt medical intervention and are still not on par with the immediacy of a gunshot.

Understanding the levels of lethality in various methods is crucial for mental health professionals in identifying risk factors and developing effective intervention strategies.