The Network of Concerned Farmers revealed on Wednesday it is preparing to send letters to GM-trial farmers outlining their legal liabilities if non GM crops are contamination during the trial, due to start next month. The WA Farmers Federation and Pastoralists and Graziers’ Association have labelled the threat a ”scare tactic” which would not intimidate farmers. WAFF chief executive Andy McMillan said farmers selected for the trial had been subjected to stringent tests, including those to prevent contamination.