This study has considered on basis of constitutionality that the attachment order of electronic device for tracking location doesn't violate the principle of prohibition against double jeopardy, over-prohibition, and rights to equality. The attachment order of electronic device for tracking location doesn't violate the principle of prohibition against double jeopardy because it is a security measure to restrict freedom without imprisonment. However double assessment of second conviction dangerousness at additional punishment to repeated offense and sentence of the attachment order of electronic device for tracking location could be raised objection of double jeopardy. A sex offence has a character that second conviction dangerousness and crime victimization are serious. Thus to release sex offenders is very dangerous, and protection of victims and social defence are necessary. Therefore the attachment order of electronic device for tracking location doesn't violate the principle of over-prohibition because there is a balance between human rights violation and public interest. The attachment order of electronic device for tracking location is applied special offences, but it doesn't violate the principle of rights to equality because of a sanction to character of sex offenders.