Seafood giant Thai Union Frozen called on the government speed up tackling human trafficking saying it was possible for Thailand to rise from Tier 3 on the US watch list this year. Expansion of the special economic zones (SEZs) to cover Nong Khai in addition to the approved locations of Mae Sot, Mukdahan, Songkhla, Aranyaprathet in Sa Kaeo as well as Mukdahan, Songkhla and Trat.