what Bobulinski has said:
https://www.newsweek.com/tony-bobulinski-hunter-biden-associate-claims-he-met-joe-biden-discussed-china-deals-1541531
Even Politico confirmed there is evidence of influence peddling back in 2019:
"Over his decades in office, ‘Middle-Class Joe’s’ family fortunes have closely tracked his political career"
https://www.politico.eu/article/joe-biden-presidential-bid-family-business-history-democrats/
Hunter told his daughter he has to float the family money:
https://nypost.com/2022/04/09/hunter-biden-frequently-covered-family-expenses-texts-reveal/
Absolute proof isn't needed in a criminal trial, and proof beyond a reasonable doubt isn't needed for an arrest. "Proof" is built upon evidence, which every link above shows evidence of potential involvement from Joe in Hunter's business dealings.