Crouch Sr. Have you wondered the veracity of any random person sending you letters under the guise of a Hogwarts professor? Being a part of the Magical Law Enforcement dept should make you all the more able to sniff out bogus claims, no?
Barty Sr: My son is in Slytherin and he hangs around with people from dark families. Not only that, but he is already a complete disappointment to me. Why would I even consider this to be fake?