The police checked the text messages from ten years ago.

Public security organs can look up the contents of short messages ten years ago according to the needs of investigation.

Legal basis: Article 150 of the Criminal Procedure Law.

After filing a case, the public security organ can take technical investigation measures against crimes endangering national security, terrorist activities, organized crimes of underworld nature, major drug crimes or other crimes seriously endangering society after strict approval procedures according to the needs of investigating crimes.

After filing a case, the people's procuratorate may, according to the needs of investigating crimes and through strict approval procedures, take technical investigation measures and hand them over to the relevant authorities for execution in accordance with regulations.

To hunt down a criminal suspect or defendant who is wanted at large or whose arrest has been approved, the necessary technical investigation measures may be taken upon approval.