We can think of two reasons as to why most NABP-approved websites are
approved by LegitScript but many LegitScript-approved websites are not
approved by NABP. One is that NABP requires interested websites to apply
and pay verification fees while LegitScript’s approval is free and does not require
website application. The second reason is that many LegitScript-certified-butnot-
NABP-certified websites do not attract significant search or click traffic on
the Internet, and some of these low-traffic websites focus on pet drugs rather
than human drugs (Chesnes, Dai, and Jin (2013), based on click-through data
from comScore).