1. 관련 CBP 규정 적용
3. 기타 사항
     가. 공증 방법
     나. 부모 동의서 양식
  • 부모 동의서 양식은 FREE FORMAT이지만, 누가, 무엇을, 어디서, 언제, 왜의 육하원칙 내용과 부모의 contact information은 반드시 포함되어야 함

What should a parental consent/permission letter look like?  Is there a Customs and Border Protection (CBP) form?
There is not a CBP Form letter, however, the parental consent letter should include: Who, What, Where, When, Why, and contact information for the absent parent(s). 
Having the letter notarized is not necessary but highly recommended.  For frequent border crossers, the letter should not exceed one year.  It is recommended to have the letter in English.

※ CBP 홈페이지 Q/A 발췌
 
     가. SPN의 경우18세 미만의  미성년자가  단독으로 여행시는 공증 된 ( Notarized) 부모의 여행동의서 필요 (의무사항)
☞ 한쪽 부모 및 친척 등  가디언이 있을 경우 동의서 불필요
     나. 서류가 없을 시 CBP에 의해 구금되거나 INAD될 수 있음
     다. 단, 수학여행, 어학연수 등 교사에 의한 인솔이 인정될 경우 공증된 부모 동의서 없이 입국할 수 있음    
※ CBP 홈페이지 공지 사항 (Help.cbp.gov)

CBP 공지사항
Children - Child traveling with one parent or someone who is not a parent or legal guardian or a group
If a child (under the age of 18) is traveling with only one parent or someone who is not a parent or legal guardian, what paperwork should the adult have to indicate permission or legal authority to have that child in their care?
Due to the increasing incidents of child abductions in disputed custody cases and as possible victims of child pornography, Customs and Border Protection (CBP)strongly recommends that unless the child is accompanied by both parents, the adult have a note from the child's other parent (or, in the case of a child traveling with grandparents, uncles or aunts, sisters or brothers, friends, or in groups*, a note signed by both parents) stating "I acknowledge that my wife/husband/etc. is traveling out of the country with my son/daughter/group. He/She/They has/have my permission to do so." See our Q&A parental consent.
* School groups, teen tours, vacation groups.
CBP also suggests that this note be notarized.
While CBP may not ask to see this documentation, if we do ask, and you do not have it, you may be detained until the circumstances of the child traveling without both parents can be fully assessed. If there is no second parent with legal claims to the child (deceased, sole custody, etc.) any other relevant paperwork, such as a court decision, birth certificate naming only one parent, death certificate, etc., would be useful.

Adults traveling with children should also be aware that, while the U.S. does not require this documentation, many other countries do; failure to produce notarized permission letters and/or birth certificates could result in travelers being refused entry (Canada has very strict requirements in this regard).
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- 동 규정은 미국 전 공항에 해당하는 강한 권고사항(Strongly recommends)으로 확인되나, 
SPN의 경우는 의무사항(Mandatory)으로 SPN CBP로부터 구도 통보 접수함