We've written extensively on our blog regarding functional capacity evaluations (FCE). The first thing to remember is that all FCEs are not the same. Prior-method testing was too open to subjective manipulation. A new testing method has been developed that uses a repeated-measures protocol. This approach has proven much more accurate, sensitive, and valid in determining sincerity of effort.
It is also fully supported by multiple studies. Find those studies here:
It is also fully supported by multiple studies. Find those studies here:

exhibit_4_st._james_hand_strength__part_ii.pdf |

exhibit_2_under_loading_study.pdf |

exhibit_3_decision_making_data__expectations_for.6__1_.pdf |