if the posted interviews are correct, you had employees using drugs while at work. You have the potential that some employees represented skills when applying for a job; an example would be the reference to employees not knowing where on the anatomy to do an injection.
Seems to me you have enough to start right now.
Step 1. Have the reporter identify those he interviewed; the ones who would not appear on camera but had plenty to say as long as they were not identifiable.
Step 2. Put those employees who allege drug use by co-workers under oath and get them to name names & dates. Same holds true for those who alledgedly could not use needles and could not make injections properly. Get names & dates.
Step 3. Review the employment history of those who are alledged to not know how to perform injections properly. If they represented they had skills or experience which they did not, that's a crime.
Step 4. By the County, institute a mandatory, random drug screen for all health department employees. Fail the test, lose your job. In fact, if the County won't do it, I hope the Health Department will.
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