  In the Next-to-Minimal Supersymmetric Standard Model with the inverse seesaw
mechanism to generate neutrino masses, the lightest sneutrino may act as a
feasible dark matter candidate in vast parameter space. In this case, the
smallness of the leptonic unitarity violation and the recent XENON-1T
experiment can limit the dark matter physics. In particular, they set upper
bounds of the neutrino Yukawa couplings $\lambda_\nu$ and $Y_\nu$. We study
such effects by encoding the constraints in a likelihood function and carrying
out elaborated scans over the parameter space of the theory with the Nested
Sampling algorithm. We show that these constraints are complementary to each
other in limiting the theory, and in some cases, they are very strict. We also
study the impact of the future LZ experiment on the theory.
