、？
I just overheard — you're a police officer who handles internet crime, is that right?
Literal
Just-now was-heard-[explanatory-んです][but-が], internet crime [object-を] handle police-officer [of-の] person [copula-だ] [something like-とか]?
Cautious confirmation question. いま聞こえたんですが 'I just overheard, but...' is a common lead-in to a confirmation question, where the speaker acknowledges having just heard something before asking about it. ~だとか at the end, stripped to だとか?, is a tentative confirmation-seeking question — 'is it something like?' rather than a direct assertion. ネット犯罪 is a modern compound, and 警察官 is the formal word for police officer.