well yeah i think so but i think some of them are secretley half blood
or even muggleborn and pretend to be pureblood
but if the sorting house had to put me somewhere it would hav eto be slytherin just so i can be near draco malfoy he is hot
and i would kick that pansy parkinson out so face it wiuld make her head spin
Tom Marvollo Riddle (Voldemort) had a muggle father, yet he was in Slytherin. I suppose the answer is that you should be ambitious, with "a certain disregard for rules" and other stuff to be in slytherin. Also, Salazar prized students who spoke parseltounge, so maybe that outwayed Riddle being a halfblood.