The copy of the contract was signed by the swindler and later found to be false. Need to use the official seal to identify. Can the copy of the liar's signature and the official seal be identified with the real seal? Public security organs have the right to investigate and collect evidence. When the public security organ considers it necessary to identify the official seal and the genuine seal of the copy signed by the liar, it may do so.

Procedures for handling criminal cases by public security organs

Article 188

After investigation, the public security organs pre-examine cases with evidence to prove criminal facts, and examine and verify the authenticity, legality and probative force of the collected and collected evidence materials.

Article 208

Investigators shall conduct an inquest or inspection on the places, articles, personnel and corpses related to the crime, and timely extract and collect traces, physical evidence and biological samples related to the case. When necessary, people with specialized knowledge may be appointed or hired to conduct inquests and inspections under the auspices of investigators.

Article 239

In order to find out the facts of the case and solve some specialized problems in the case, people with specialized knowledge should be employed for appraisal. If it is necessary to hire a person with specialized knowledge for appraisal, an invitation letter for appraisal shall be made after the approval of the person in charge of the public security organ at or above the county level.

Article 240

The public security organ shall provide necessary conditions for the appraiser to carry out the appraisal, send relevant samples, comparison samples and other original materials to the appraiser in time, introduce the situation related to the appraisal, and clearly put forward the problems that need to be solved by the appraiser. It is forbidden to imply or force an appraiser to make an appraisal opinion.

Article 242

Appraisers should independently evaluate by scientific methods according to the evaluation rules. After the appraisal, it shall issue an appraisal opinion, sign the appraisal opinion, and attach the qualification certificate or other supporting documents of the appraisal institution and appraiser. If more than one person participates in the appraisal, if the appraisers have different opinions, it shall be indicated.

Article 243

Investigators shall review the expert opinions. The public security organ shall promptly inform the criminal suspect, the victim or his legal representative of the expert opinions used as evidence.

Extended data

Criminal law of the people's Republic of China

Article 224? Contract fraud

Under any of the following circumstances, if the amount involved is relatively large in the process of signing and performing a contract for the purpose of illegal possession, he shall be sentenced to fixed-term imprisonment of not more than three years or criminal detention and shall also or only be fined; If the amount is huge or there are other serious circumstances, he shall be sentenced to fixed-term imprisonment of not less than three years but not more than ten years and shall also be fined; If the amount is especially huge or there are other especially serious circumstances, he shall be sentenced to fixed-term imprisonment of not less than 10 years or life imprisonment, and shall also be fined or confiscated.

(1) Signing a contract in the name of a fictitious unit or others; ?

(2) Mortgaging with forged, altered or invalid bills or other false property rights certificates; ?

(three) to perform a small contract or part of the contract first, to deceive the other party to continue to sign and perform the contract, and to have no actual performance ability; ?

(4) After receiving the payment for goods, advance payment or secured property paid by the other party; ?

(5) defrauding the other party's property by other means.