More than that, it would have to have to be statistically significant versus crime in similar counties, cities, and the country as a whole. Some quick searches[0] show an overall crime drop in the USA since 1999, ~2010, and certainly the beginning of the reporting period. Unless this activity is nationwide, which given the usual nature of the policing policy, I reject out of hand.
One consideration about the 1990s crime drop should be the Lead-crime hypothesis[1], which basically refers to the banning and reduction of lead in fuel and consumer products in the 1970's bearing fruits a couple of decades later as people begin to mature in a less toxic environment. The information I have reviewed[2] about the US and even internationally[3] is quite compelling to me. Motherjones has collected all of this information.[4]
There could be a similar phenomenon (not necessarily environmental, but prop65 passed in 1986 and there is also the 1974 SDWA[5] with substantial amendments in 1986, and 1996, as well as numerous changes in the period about the 1990s) affecting the country after about ~2000 and again ~2010, but I do not know of any other information supporting this analysis.
[0] - https://www.statista.com/statistics/191219/reported-violent-...
[1] - https://en.wikipedia.org/wiki/Lead%E2%80%93crime_hypothesis
[2] - https://www.sciencedirect.com/science/article/pii/S016041201...
[3] - https://pic.plover.com/Nevin/Nevin2007.pdf
[4] - https://www.motherjones.com/environment/2016/02/lead-exposur...
[5] - http://www.epa.gov/laws-regulations/summary-safe-drinking-wa...