If there are primordial black holes in the dark matter
halo, they must collide with the Galactic neutron stars (NS) and
produce light black holes (LBH), with masses below 1.4 M_Sun. This
has observational consequences that may be checked by microlensing,
by LIGO-Virgo-Kagra iterferometers detecting gravitational waves
from collisions of LBH with NS and BH, by detecting LBH in X-ray
binaries and from pulsars statistics.
