Normally while buying chicken from a butcher's shop i see some blood in chicken in one case a drop off blood came in my body and shirt is that blood paak, because the blood left after the slaughtering

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98. If an animal whose meat is halal to eat, is slaughtered in accordance with the method prescribed by Shariah, and enough blood flows out, the blood of which is still left in its body is Pak. However, the blood which goes back into the body of the animal due to breath, or because of its head having been at a higher level at the time of its slaughtering, is najis.