What do I do if the client is not taking the results seriously?
What do you do if you don't think your client contact is taking your investigation, or your investigative results very seriously? It's incredibly frustrating when somebody makes a bad decision with your investigation. It is also frustrating when they make no decision with your investigative results. But, at the end of the day, if you don't genuinely believe that your obligations end with the investigation, then you're not neutral or unbiased. I suppose if it was a really egregious situation and there was counsel above them at the home office, perhaps, you could let that person know about it, but really if you are dealing with a competent, empowered person to receive your investigative results, and you don't like what they're doing, you need to check that you're still an unbiased investigator.
What an employer does after understanding the circumstances (the business risks) uncovered by your investigation, is beyond the scope of an external investigation. Obviously, none of this refers to egregious situations or situations covered by other statutes, like obligations to report child abuse.