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It's paid as part of the employee's compensation package, you f'n goat.
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It's paid because the government forces us to pay it. Unemployment is just another welfare program. Just like workmans comp, It's not part of your compensation package, find a legal job in America where the employer doesn't have to pay into it? It's just like social security, a ponzi scheme.
Drug tests for law makers as well as welfare and enemployment seekers would NOT be a violation of the 4th amendment because it would be voluntary. If you choose not to take the test, no "benefits".
RvW, where do you get the idea that public safety employees are not drug tested?