@ButtWorldsMan @Tfmonkey @VooDooMedic @mrhorsetwat
This article seems to have the most evidence: https://www.voanews.com/a/uk-presents-evidence-linking-iran-in-houthi-weapon-supply/6961928.html
It claims to have evidence that Iran, the state, is backing the Houthis as they found in a shipment of materials a drone which has test flight logs from Iran. The article also cites a few other occasions when weapons were seized that the article claims were "heading to the Houthis" or were "traced back to Tehran."
This is the newest article. Everything else is pre-2023.