NSA: To paraphrase the old cliche',  "some of my best friends are lawyers."  I understand the need to sue everyone within reach...you can always dismiss/withdraw a claim if you like, but, like you say, it's tougher to add someone later.  As you say, if the employer had knowledge that the employee was likely to drink while driving a company vehicle, negligence is possible.  I'll remember "nosugaradded" if I get "rearended"......regards, Gary