According to Idaho state law, anyone who meets any of the following cannot get a license to carry concealed weapons: 

• is under age twenty-one (although there are exceptions in the law regarding people age 18 - 21);
• is currently formally charged with a felony crime;
• has been found guilty in any court of a felony crime;
• is a fugitive from justice;
• is an unlawful user of marijuana or any depressant, stimulant or narcotic drug, or other controlled substance;
• is currently suffering from (or has been adjudicated as having suffered from) any of the following conditions:
  • lacks mental capacity;
  • is mentally ill;
  • is gravely disabled; or
  • is an incapacitated person;
• has been discharged from the armed forces under dishonorable conditions;
• has received a withheld judgment or suspended sentence for a felony crime (unless the person has successfully completed probation);
• has received a period of probation after having been adjudicated guilty of, or received a withheld judgment for, a misdemeanor offense that has as an element the intentional use, attempted use or threatened use of physical force against the person or property of another (unless the person has successfully completed probation);
• is an "alien" illegally in the United States;
• was a citizen of the United States but has renounced his/her citizenship;
• is free on bond or personal recognizance pending trial, appeal or sentencing for a crime which would disqualify him/her from obtaining a concealed weapons license;
• is subject to a domestic violence protection order that restrains him/her from harassing, stalking or threatening an intimate partner, his/her own child, or a child of the intimate partner; or engaging in other conduct that would place an intimate partner in reasonable fear of bodily injury to the partner or a child; or
• is for any other reason ineligible to own, possess or receive a firearm under Idaho law or federal law.¹

In addition, Idaho law says that anyone convicted of any of the following felony crimes permanently loses his/her right to "ship, transport, possess or receive" a firearm: aggravated assault; aggravated battery; assault with intent to commit a serious felony; battery with intent to commit a serious felony; burglary; crime against nature; felony domestic battery; felony enticing of children; forcible sexual penetration by use of a foreign object; felony indecent exposure; felony injury to child; felony intimidating a witness; lewd conduct with a minor or child under sixteen; sexual abuse of a child under sixteen; sexual exploitation of a child; felonious rescuing prisoners; escape by one charged with, convicted of or on probation for a felony; unlawful possession of a firearm; degrees of murder; voluntary manslaughter; assault with intent to murder; administering poison with intent to kill; kidnapping; mayhem; rape; robbery; ritualized abuse of a child; cannibalism; felonious manufacture, delivery or possession with the intent to manufacture or deliver, or possession of a controlled or counterfeit substance; trafficking; felony threats against state officials of the executive, legislative or judicial branch; unlawful discharge of a firearm at a dwelling house, occupied building, vehicle or mobile home; unlawful possession of destructive devices; unlawful use of destructive device or bomb; or attempt, conspiracy, or solicitation, to commit any of the above-mentioned crimes.² 

If any of these situations apply to the abuser, it may be illegal for him/her to have a gun.  Also, federal laws, which apply to all states, restrict an abuser's right to have a gun if you have a restraining order against him/her that meets certain requirements or if s/he has been convicted of a felony or domestic violence misdemeanor.  Go to Federal Gun Laws to get more information.

¹ ID Code § 18-3302(11)
² ID Code § 18-310(2)