Usage Note
Suspecter is a formal or journalistic verb; in everyday speech the construction soupçonner or se douter que is more natural. Suspecter quelqu'un de quelque chose is the standard construction (on le suspecte de fraude). The related noun suspect and adjective suspect/suspecte are common across all registers.
Examples
"La police le suspecte de vol."
Natural Translation
The police suspect him of theft.

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