Minimum wage clerk is not liable due to many laws that protect employees from wage abuse without a judgement in court[1] but they can surely get fired for negligence in reporting suspicious activity.

[1] http://www.seyfarth.com/dir_docs/publications/NEHT01120810.p...

>As a practical matter, the Court’s decision means that employers can- not safely take deductions for theft or damage to property unless fault and value have been determined by a court of law or government agency.