Depending on how long it takes can be queried. The function of WeChat software is realized by the background program code, as a WeChat user we delete the chat records in the software background will be retained.

In general, we will not be involved in calling the background data. But if it is used for case investigation, general criminal cases criminal police units have cell phone data acquisition instruments, in addition to not deleted will be found, but also can be deleted records to repair, debris repair time depends on the time and frequency of record deletion.

If the case level is quite high, how long the chat records can be queried. You can go to Tencent's backstage query, the procedure is cumbersome, but you can query.