BETA, through the work of the Feed Committee, has considered the issues surrounding the control of such occurrences (Wynne 2006) and whilst recognizing that it is impossible to be absolutely certain that a feed material is completely free from such substances, it has established that good purchasing and manufacturing practice together with adoption of suitable risk analysis and management by horse owners can go a long way towards precluding such contaminants and substantially reducing the risk of their presence in the horse.