Legal analysis: Knowing the backtesting offline backtesting can find out the authenticity and validity of the candidate's background information and supporting materials, etc. by consulting with the candidate's former supervisors, the people who have had the opportunity to observe him/her lately, the institutions where he/she has been educated, the referees, and other objects.

Legal basis: The Criminal Procedure Law of the People's Republic of China

Article 286 If a person who was under the age of eighteen at the time of committing a crime is sentenced to less than five years of fixed-term imprisonment, the relevant criminal record shall be sealed.

Criminal records that have been sealed shall not be made available to any unit or individual, except where the judicial authorities need to do so for the purpose of handling the case or where the relevant unit conducts inquiries in accordance with the provisions of the State. Units conducting inquiries in accordance with the law shall keep the circumstances of the sealed criminal records confidential.

The Supreme People's Court, the Supreme People's Procuratorate, the Ministry of Public Security, the Ministry of National Security, the Ministry of Justice, "Opinions on the Establishment of a Criminal Record System for Offenders" The criminal record is an objective record of the situation of offenders by the specialized organs of the State. The criminal record system is an important element of the modern social management system. In order to meet the needs of economic and social development in the new period, and further promote innovation in social management, maintain social stability and promote social harmony, we hereby put forward the following opinions on the establishment of a criminal record system for offenders in China.