  We calculate the production of 2 b-quark pairs in hadron collisions. Sources
of multiple pairs are multiple interactions and higher order perturbative QCD
mechanisms. We subsequently investigate the competing effects of multiple
b-pair production on measurements of CP-violation: i) the increase in event
rate with multiple b-pair cross sections which may reach values of order 1 barn
in the presence of multiple interactions and ii) the dilution of $b$ versus
$\bar b$ tagging efficiency because of the presence of events with 4
$B$-mesons. The impact of multiple $B$-meson production is small unless the
cross section for producing a single pair exceeds 1~mb. We show that even for
larger values of the cross section the competing effects i) and ii) roughly
compensate so that there is no loss in the precision with which CP-violating
CKM angles can be determined.
