  Guided by the non-relativistic effective field theory of interactions between
Weakly Interacting Massive Particles (WIMPs) of spin 1/2 and nuclei we study
direct detection exclusion plots for an example of non-standard spin-dependent
interaction and compare it to the standard one. We analyze an extensive list of
15 existing experiments including the effects of momentum dependence and
isospin violation. In our analysis, we fixed the dark matter velocity
distribution to a Maxwellian.
