to be under investigation / to be in the prosecutor's crosshairs
Eine Person steht unter besonderer Beobachtung oder Ermittlung durch die Staatsanwaltschaft.
Means that a person is being closely watched or investigated by the public prosecutor's office.
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Pass auf, was du sagst; bei dir hat der Staatsanwalt den Finger drauf.— Watch what you say; the prosecutor has his finger on you.