When you have a suspicion about someone or something, you suspect them. It is not standard to say you “suspicion” them. “Suspicion” is only a noun, never a verb.
Motorist charged on suspicion of hit-and-run A man was charged Tuesday in Napa County Superior Court on suspicion of hit-and-run and driving under the influence in connection with a crash reported last weekend, according to court records.
June 12, 2013 - Napa Valley Register