Halakhah su Levitico 21:4

Moreover, as is evident from the discussion of the Gemara, Nazir 42b, and Rambam's own terminology in Hilkhot Nezirut 5:19, any leniency with regard to simultaneous contact with a second corpse is predicated upon the consideration that a kohen is prohibited from coming into contact with a corpse because of the admonition "He shall not defile himself… to profane himself" (Leviticus 21:4) which is regarded as excluding from the prohibition an instance of a kohen who confronts no additional profanation in the act of contact. To be sure, a kohen defiled through contact with metal suffers no additional defilement but, since his contact with metal does not constitute an act of profanation of his priestly status, he remains bound by the prohibition against coming into contact with a corpse since that act represents not merely an act of defilement but also an act of profanation.