Lotts book has multiple methodological problems and certain realities that cast doubt on his contention that more guns equals less crime.
1. Crime in general was declining before CW laws were in place
2. States in which concealed weapons bans are in place saw crime decreases
3.The National Research Council of the National Academies found several methodological problems in Lott's work and stated that "that with the current evidence it is not possible to determine if there is a causal link between right to carry laws and crime rates."
4.The Harvard Injury Control Research Center reviewed a massive quanity of scientific research (including Lott's work) and has concluded that "concealed carry laws have been neither beneficial nor detrimental."
5. The most scientifically accurate statement that can be supported by the evidence is that concealed carry laws have had little if any influence on crime.