That may or may not be true, but I feel it's worth mentioning that often those individuals need some level of security clearance. See listings on job boards for

That may or may not be true, but I feel it's worth mentioning that often those individuals need some level of security clearance. See listings on job boards for janitorial staff/etc. that require security clearance (often at private corporations, like defence contractors, but I see no reason why it wouldn't extend to public employment i.e. at the Capitol).