This is the 3353rd most frequent Russian word.
подозрению
Suspicion.
Here, 'подозрением' is used in the context of being suspected or doubted, typically implying that Mark might have had involvement in the disappearance of the documents.
Марк оказался под подозрением после исчезновения документов.
Mark fell under suspicion after the documents disappeared.
In this sentence, 'подозрения' is utilized to signify doubt or mistrust—specifically, it denotes that the explanations were credible and did not raise any doubts.
Её объяснения не вызвали у нас никакого подозрения.
Her explanations did not evoke any suspicion in us.
The usage of 'подозрения' here refers to the act of categorizing a behavior as being suspicious or questionable.