Fifty-two percent of employers have updated or implemented a “zero tolerance” workplace violence prevention policy in response to mass shootings at U.S. workplaces in recent years, according to the results of a survey conducted by labor law firm Littler Mendelson.

Researchers surveyed 844 in-house counsel, human resources professionals, C-suite executives and others from a variety of industries for The Executive Employer Survey, released on July 12. Other highlights from the survey:

• 40 percent of employers have developed an emergency response plan, as well as a pre-employment screening process.
• 38 percent have conducted employee training sessions about how to recognize and respond to a potentially violent situation.
• 33 percent have performed a safety and security audit.
• 28 percent have conducted active shooter response training.
• Eleven percent of respondents said they have taken no action because violence is not considered an issue at their workplace, while another 1 percent have not acted for fear of violating disability or discrimination laws.

In addition, the survey found that more than a third of employers at large-cap organizations (34 percent) said they use, or are considering using, data analytics to help make workplace decisions, such as hiring and performance evaluations.