"violated policy" is correct and usable in written English.
You can use it when referring to someone who has transgressed an established rule or code of conduct, such as a set of guidelines within a workplace or school. For example, "The employee was reprimanded for violating company policy."
The Pentagon's inspector general looked into whether his e-mails with Jill Kelley, a socialite from Tampa, Fla., violated policy, regulation or military law.
PAGE A3 Merrill's Chief Apologizes Shortly after Merrill Lynch's chief apologized for the behavior of some analysts and pledged to punish anybody who violated policy, the firm dismissed one analyst.
Ann Talbot, Golden State's chief financial officer, learned later that the office manager had violated policy by visiting a social networking site, which the company said it believed was how her computer was infected with malicious software, or "malware," that antivirus software did not detect.
After Police Commission rules LAPD shooting violated policy, family urges criminal charges.
The commission later conceded the agents violated policy during the incident.
Breaking with long-standing practice, police Superintendent Eddie Johnson almost immediately revoked the police powers of the three officers who fired shots, saying it appeared they'd violated policy.
The university determined in October 2015 that he had made "unwelcome sexual advances" toward her and violated policies.
Related: Police Shooting of 18-year-old may have violated policies, Chicago's top cop says.
We just don't want developers to do it by violating policy.
The shadow process monitors the application process' activity, ready to respond immediately if the application violates policy.
Actual practice may vary from state policy (though if it is evident that programs widely violate policy with state knowledge we do not give credit).
