For at-will employment, as noted, you don't even need a reason. You can be terminated because you didn't shave. Or because the boss doesn't like you, you don't fit in, you posted some stupid picture on Facebook, etc. If it's not discriminatory or they asked you to do something unsafe, you're out.
I used to deliver auto parts as part of my side job with a parts store back in the 70s. The Trans Am left a pretty good trail of tickets. The insurance company sent my boss a letter saying I wasn't allowed to drive any company vehicles. So I delivered parts after than in the T/A. "You need it when? No problem, I'll send my guy..." Cross town in 15 minutes - faster than pizza. I guess that would be some early "don't ask, don't tell"
"
At-will employment is a doctrine of
American law that defines an employment relationship in which either party can break the relationship with no liability, provided there was no express contract for a definite term governing the employment relationship and that the employer does not belong to a collective bargaining group (i.e., has not recognized a
union). Under this legal doctrine:
<table class="cquote" style="margin:auto; border-collapse: collapse; border: none; background-color: transparent; width: auto;"><tbody><tr><td style="vertical-align: top; width: 20px; border:none; color:#B2B7F2;font-size:35px;font-family: 'Times New Roman', serif; font-weight: bold; text-align: left; padding: 10px 10px;">“</td> <td style="vertical-align: top; border: none; padding: 4px 10px;">any hiring is presumed to be "at will"; that is, the employer is free to discharge individuals "for good cause, or bad cause, or no cause at all," and the employee is equally free to quit, strike, or otherwise cease work.<sup id="cite_ref-0" class="reference">
[1]</sup></td></tr></tbody></table>