It has stated its intention to investigate allegations vigorously and instigate enforcement action where clear evidence of a breach of the legislation exists.The Agency has investigated several reports of the use of unlicensed chemicals to date. In 1998, following such investigations, a salmon-farming company in Shetland was fined £1000 at Lerwick Sheriff Court for discharging Deosan Deosect, a compound used to treat horses and poultry.