He examines the organs and vessels immediately after severance by the shechita incision, to ascertain that the shechita was properly performed, this examination is visual and tactile (b'dikath ha'simanim).This integral part of the shechita process is required by Halacha (Y.D. 25:1). The shochet also examines the internal organs and lungs (b'dikath ha'reyah) of an animal in order to ascertain whether there are any abnormalities or defects disqualifying the animal from being kosher (Y.D. 29-60).