Sounds like the employer did make an effort--sending the 'pee-er' to counseling. Its not clear that there are any legal steps to take since you didn't related the types of other incidents so its tough to give a meaningful answer except to say your friend should continue to report incidents to the company and to police where warranted so as to build a portfolio and to see a local attorney about options.
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I am sorry for your friend. First the destruction of property by urinating on it is criminal. The greater the value of property destroyed the more severe the crime. The crime is called Criminal Mischief and can range from a Class C misdemeanor to a felony. Also if the harassment involves repeated telephone calls (telephone harassment) or statements threatening bodily injury or death (terroristic threat) those are also criminal conduct.
Lastly, if the threats are based on race, religion, sex gender etc. your friend might also be able to file a complaint through the EEOC. Your friend should consult with a local attorney as soon as possible.
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