Bullshit. A TBI can certainly cause a broad number of behavioral regulation and inhibition issues (in addition to memory and genera cognition problems) but the notion that it can be localized to a specific part of the brain for regulating cursing is nonsense.
In terms of federal employment law, the Americans With Disabilities Act requires that employers make “reasonable accommodations” for disability conditions, which can include adequately documented and certified instances of traumatic brain injury, and some state laws are even more expansive. This doesn’t mean that your employee in a customer facing position is allowed to curse freely and without restraint. You mention working for a big box retailer so they definitely have an HR department and extensive policies regarding various disability conditions. Since you are the direct supervisor but do not have any binding disciplinary authority, you should refer this to your supervisor with a written record of your attempts to counsel the employee in question as well as any customer complains or reactions, and let him or her take it up the chain to management and HR.
Well, you’re no fun. Those are the best part of “management retreats”.
Stranger