The advice will come as a significant boost for pro-hunt campaigners.
Labour is to repeat the offer of a free vote for MPs on hunting in the next parliament.
MPs are likely to back an outright ban, although there is also a strong view in government supporting a system of hunting with a licence. The committee warns that if the proposed hunting authority were to deny, or withdraw a licence to hunt on someone's land, it would be equivalent to dispossessing someone of their rights. The letter also warns the bill gives a very wide discretion to the hunting authority to in spect and intervene on other people's property. The absence from the bill of clear limits to the power of inspection seems to give rise to a significant risk that the exercise of the power will violate article 8. There appears to be a significant risk that neither the scope of the power of inspection nor the criteria for exercising it nor the permitted manner of its exercise will be sufficiently clear, accessible and controlled by law.