Task: Translation
Input (Japanese): 鍵となる証拠はビデオ映像と獣医師の証言だが、この獣医師は警察が怪しいとおぼしき現場に手入れした際に同伴していた時もあった。
Output (English): Key evidence includes video footage and testimony from veterinary surgeons, who were present when police raided several locations suspected to be involved.