Studies of individual laws Other studies have examined trends in firearm-related deaths before and after gun control laws are either enacted or repealed. A 2004 study in the Journal of the American Medical Association found evidence that child access prevention laws were "associated with a modest reduction in suicide rates among youth aged 14 to 17 years." Two 2015 studies found that the permit-to-purchase law passed in Connecticut in 1995 was associated with a reduction in firearm suicides and homicides. One of these studies also found that the repeal of Missouri's permit-to-purchase law was associated with "a 16.1% increase in firearm suicide rates," and a 2014 study by the same research team found that the repeal of this law was associated with a 16% increase in homicide rates. A 2000 study designed to assess the effectiveness of the Brady Handgun Violence Prevention Act found that the law was not associated with reductions in overall homicide or suicide rates, but that it was associated with a reduction in the firearm suicide rate among individuals aged 55 or older. A 1991 study looked at Washington, D.C.'s Firearms Control Regulations Act of 1975, which banned its residents from owning all guns except certain shotguns and sporting rifles, which were also required to be unloaded, disassembled, or stored with a trigger lock in their owners' homes. The study found that the law's enactment was associated with "a prompt decline in homicides and suicides by firearms in the District of Columbia." A 1996 study reanalyzed this data and reached a significantly different conclusion as to the effectiveness of this law.
sTUDIes of INdiVIduaL LaWS other stuDiEs have examIned trends iN fIREArm-reLAteD DeAths befoRE aND aFTer gun coNTrol lawS are eIther enacTEd oR repealed. A 2004 sTudy in ThE Journal of The amerIcAN medIcal assOCIatiON FouND eVidenCe thaT Child ACCesS pReVeNtion lawS wERe "ASsoCiAteD With a modesT reDUction in suicIde rates among youth agED 14 To 17 Years." two 2015 sTudiEs found that the peRMit-tO-purCHAse lAw pAsSeD In coNneCtICut in 1995 Was AsSOcIaTed With a ReduCtiON IN firEaRm suIcideS and HomiCidEs. one OF thESe studies alsO found That The RepEal oF mIssOuri's Permit-to-pUrcHASe LAw WAs AsSoCIateD With "A 16.1% incReasE iN fiRearm suIcide raTeS," anD a 2014 STUdy bY tHe saME ResearCH TEam founD that tHe repeaL of thiS lAw was associaTeD wiTH a 16% InCrEase in hOMicidE ratEs. a 2000 Study dEsiGneD to ASseSs The EffectIvenESS of the BRAdy handGuN vioLEncE prEventIon act found that the lAW Was Not associAted witH ReductiONs iN overalL homicIDE Or SuicidE ratES, but that it waS asSociateD with a RedUcTioN in the fIReArm suIcIde raTe AmoNg indiVIduALS aged 55 oR OlDeR. a 1991 stUdy loOKed aT wAshington, d.c.'s FiREarms CoNtrOl regUlAtiONs Act of 1975, wHIch BAnNeD iTs resIDEnts frOm OwNinG aLL gUNs exCept certaiN SHotgUnS And SPOrtinG rifLes, which wErE ALSO REqUIred to bE uNLOadED, DisASsEmBLed, or storEd wiTH a tRiggER locK In TheiR OWners' HoMeS. THE sTuDy founD that the law's enActment was assOCIated wiTH "a promPt dEclINE IN hOMIcideS aNd SUicides bY FIreaRMS IN the DisTRIcT of cOlumbia." a 1996 study reanALyzeD This dAta And ReAchEd a siGnificanTly dIfFerenT conCLusiOn As To The effectIVEnesS of thIs lAw.