I find the time sheet thing fascinating. There are a few options, each of which can be easily checked:
1) No check ever cut against allegedly bogus time sheet - clearly a forgery, JV vindicated. NU must fire someone.
2) Check cut against these time sheets but no other time sheet submitted - if JV cashed the check, then he is guilty of fraud, because he knows he didn't work the hours. If not, he is completely clear.
3) Check cut against these time sheets, plus a check cut against the legitimate time sheet - if JV cashed both, he committed fraud. If he only cashed the legitimate time sheet, he is cleared.
Should not be difficult for the truth to emerge.