The percentage of cops who beat their wives is a controversial topic, and there are varying statistics and interpretations of the available data. However, the most commonly cited statistic is that 40% of police families experience domestic violence. It is important to note that this statistic does not necessarily mean that 40% of police officers themselves are abusers, as the abuser is not always specified to be the police officer and the victim is not always specified to be the spouse.

There are also studies that suggest lower percentages of police officers who abuse their spouses. For example, one study found that only 1% of police officers abuse their spouses in an officially recognized capacity. Another study found that 28% of police officers admit to committing minor or severe violence against their spouses, and 33% of police officers report experiencing minor or severe violence from their spouse.

It is worth noting that data on police domestic violence is notoriously difficult to gather and is often skewed by a culture of silence and intimidation. Additionally, the available data is often based on surveys and self-reporting, which may not be entirely accurate. Regardless of the exact percentage, it is clear that police domestic violence is a serious issue that needs to be addressed.