Is there substantial proof for your case?
Substantial evidence or proof of guilt must exist to clearly establish that the employee did violate the work standard or rule. Evidence can be documented or witnessed it cannot be rumors, unsupported accusations, or superficial allegations. "Substantial" is determined by what is called the "reasonable person" standard: given the available information, how would a reasonable person evaluate it? If the evaluation falls short of this standard, return to the investigation or drop the issue.