Drones, informers and apps: Iran intensifies surveillance on women to enforce hijab law

Iranian police are using digital tools to identify and punish women who defy the Islamic state's harsh dress code

Like many women in Iran, Darya is used to feeling under surveillance. Yet in recent months, the 25-year-old finance analyst from northern Tehran says that she never knows who could be watching her every move.

She says she has received messages from the police before warning her of suspected violations of the country's strict hijab laws, but last November she was sent an SMS message containing her car registration plate that stated the exact time and place that she had been recorded driving without her head properly covered. Next time it happened, the SMS warned, her car would be impounded.