In the context of Muslims touching pork, an IslamWeb fatwa writes:
Scholars of Islam (Ulamah) state that touching impurities directly is unlawful except for a necessity.
I was unsuccessful at finding another, more reliable reference for this.
Question: Is there a scholarly consensus that "touching impurities directly is unlawful except for a necessity"?
The obvious searches
site:islamqa.org touching impurities;
site:islamweb.net touching impurities;
site:islamqa.info touching impurities didn't allow me to verify the consensus. Although the fatawa it comes back with talk about what to do when one touches a wet dog, thereby becoming impure, but without forbidding touching a wet dog, which makes me doubt the IslamWeb claim.