A report suggests that livestock farmers in Wales who illegally cull badger sets may be contributing to the spread of bovine TB.
Researchers from Bangor University say around 10% of Wales' 14,000 livestock farmers had killed badgers in the 12 months preceding the study.
The data was gathered by talking to farmers at markets and livestock events in Wales last year. The report concludes that policymakers have to factor in illegal killing when tackling Bovine TB.
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Local authorities said the move is necessary to "avert the growing number of deaths and increasing harm linked to psychoactive substances".