Test report if there is no test organization's special seal, the test report is equivalent to invalid, not effective. Third-party testing organizations only in the test report is stamped will have legal effect, that is, will be responsible for the test report. So you must find the previous testing organization and let it give the appropriate seal.
The use of any unit of the official seal, must strictly abide by the leadership approval system. That is, each use of the unit seal must be approved by the legal representative of the unit agreed, if the legal representative of the unit out of town or due to other important tasks can not be approved for use, but also by the legal representative of the unit must be authorized by the deputy and other appropriate personnel to approve the use of the unit. Specific managerial personnel shall not use the official seal of the unit for anything without authorization.
Extended information
According to the "Chinese People's *** and State Criminal Law"
Article 280 The crime of forging, altering, buying and selling the official documents of the state organs, documents, seals forging, altering, buying and selling, or stealing, snatching, destroying the official documents of the state organs, documents, seals shall be punished by fixed-term imprisonment of not more than three years, criminal detention, control or deprivation of political rights; if the circumstances are serious, the penalty shall be fixed-term imprisonment of not less than three years and not more than ten years. Article 52 Anyone who commits any of the following acts shall be sentenced to not less than ten days but not more than fifteen days of detention, and may be fined not more than one thousand yuan; if the circumstances are less serious, he or she shall be sentenced to not less than five days but not more than ten days of detention, and may be fined not more than five hundred yuan:
(1) Forging, counterfeiting, or trading in the official documents, certificates, or seals of a state organ; or p>(1) forging, altering or trading in official documents, papers, certificates or seals of state organs, people's organizations, enterprises, institutions or other organizations;
(2) trading in or using forged or altered official documents, papers, certificates or certificates of state organs, people's organizations, enterprises, institutions or other organizations;
(3) forging, altering, or reselling Tickets, tickets, air tickets, tickets for cultural performances, tickets for admission to sports competitions, or other valuable tickets or vouchers;
(4) forging or altering a ship's household registration plate, buying, selling or using a forged or altered ship's household registration plate, or altering a ship's engine number.
Baidu Encyclopedia - Criminal Law of the People's Republic of China