Legal analysis: Public security organs will take technical investigation measures after filing a case. If the online fraud is more than 3,000 yuan and suspected of fraud, it should be reported to the public security organ in time, and the public security organ will file a case for investigation. After solving the case, the suspect will be arrested and the money will be recovered. Solving a case depends on the conditions of handling the case and the ability and quality of the police. The public security organ may take necessary technical investigation measures against the fugitive criminal suspect or defendant who is wanted or has been approved or decided to arrest.

Legal basis: Provisions on Procedures of Public Security Organs Handling Criminal Cases

Article 248 In order to find out the facts of a case and solve the specialized problems in a case, a person with specialized knowledge shall be appointed and hired 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 263 After placing a case on file, the public security organ may, according to the needs of investigating crimes, take technical investigation measures for the following criminal cases that seriously endanger society: (1) crimes that endanger national security, crimes of terrorist activities, crimes committed by underworld organizations, and major drug crimes; (two) intentional homicide, intentional injury causing serious injury or death, rape, robbery, kidnapping, arson, explosion, throwing dangerous substances and other serious violent crimes; (3) Group, serial and trans-regional major criminal cases; (four) the use of telecommunications, computer networks, delivery channels and other major criminal cases, as well as major criminal cases against computer networks; (5) Other criminal cases that seriously endanger society may be sentenced to fixed-term imprisonment of more than seven years according to law. The public security organ may take necessary technical investigation measures against the fugitive criminal suspect or defendant who is wanted or has been approved or decided to arrest.