In 2009, Niceley was one of four Republican members of the Tennessee House who announced plans to join a legal action to force President
Barack Obama to
release his birth certificate and prove his citizenship. During a Tennessee House committee hearing in February 2012, Niceley declared that
coyotes had been introduced to Tennessee by the
Tennessee Wildlife Resources Agency to control the
wild deer population, but had subsequently become pests that attack livestock.
PolitiFact Tennessee determined that coyotes had arrived in the state naturally, and that Niceley had repeated a previously debunked "urban myth". Niceley rejected
mainstream views of climate science. At a December 2017 meeting of the
American Legislative Exchange Council, he told an
E&E News reporter: "I think the whole premise that
carbon dioxide is a pollutant is flawed. It's not a pollutant, it's just as natural as oxygen. The trees and plants depend on CO2 just the same way we depend on oxygen." In 2022, while speaking in favor of a bill that would make camping on any public property punishable by a $50 fine, Niceley cited
Adolf Hitler as an example of someone who worked his way out of homelessness. In response to arguments against
his ivermectin bill by two fellow Senators, pointing to potential overdoses, Senator Niceley responded in closing: "It is a lot safer go to your pharmacist and let him tell you how much ivermectin to take than it is to go to the co-op and guess what size horse you are." == Legislative accomplishments ==