The State Council has unveiled pilot vetting rules for foreign investors seeking a stake in sensitive sectors of China’s four free-trade zones that will come into effect early next month, South China Morning Post reported. Under the pilot rules, investments by foreign companies will be strictly reviewed if they involve a controlling stake of any business deemed vital to national defense, the economy, social order, culture, the Internet and other sensitive technological research areas. Only those with written commitments that can ease the security concerns of authorities will be allowed to invest in these areas.