Usage Note
soupçonner takes a direct object for the person suspected — je le soupçonne de mentir. The related noun soupçon also means a tiny amount in cooking (a soupçon of salt), a nuance that has been borrowed intact into English. The past participle is soupçonné.
Examples
"La police le soupçonne du vol."
Natural Translation
The police suspect him of the theft.

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