TPPA: When foreign investors sue

An American company, Renco, sued Peru for US$800mil (RM2.6bil) because its contract was not extended after the company’s operations had caused massive environmental and health damage.
There are several implications of the ISDS. Not conforming to TPPA rules can carry a heavy penalty, since a government can be sued in an international court and thus, that government will be constrained when formulating future policies or implementing existing ones.
It is difficult for a government to make new policies, as it cannot predict whether certain policies it wishes to introduce or change is allowable, since it is uncertain or unpredictable how a tribunal will view this, i.e. the view of a particular tribunal can differ from that of another tribunal.
http://www.thestar.com.my/Opinion/Columnists/Global-Trends/Profile/Articles/2013/08/12/When-foreign-investors-sue.aspx