Comparison: drug use as a factor to blame for mass shootings in the US, 2011 and 2013

The statistic shows a comparison of the results of a survey among Americans in 2011 and in 2013 on the reaons for mass shootings. They were asked how much they think drug use is responsible for these shootings. In January 2011, 42 percent of respondents said drug use was to blame a "great deal" for these shootings. In 2013, 37 percent of respondents said the same.