The handling method for bank cards frozen by off-site criminal investigation is as follows:

1. Contact the bank where the account is opened to understand the reason for freezing;

2. If it is suspected of illegal crimes, you should Cooperate with the police investigation;

3. Provide necessary supporting materials to prove the legality;

4. If the freezing is a mistake or the case has been resolved, apply to lift the freezing.

Security protection measures for bank cards:

1. Change bank card passwords regularly;

2. Do not perform bank card operations on unofficial websites;

3. Avoid using bank cards for transactions in public places;

4. Enable the SMS notification function for bank card transactions.

These measures help improve the security of bank cards and reduce the risk of being frozen.

To sum up, when a bank card is frozen by criminal investigation in another place, you should first contact the bank where you opened the account to understand the specific reasons. If you are suspected of illegal crimes, you need to cooperate with the police investigation and provide relevant supporting materials to confirm the legality of the funds. If it is confirmed to be a misoperation or the relevant case has been resolved, you can apply to the bank to lift the freeze.

Legal basis:

"Procedural Regulations for the Handling of Criminal Cases by Public Security Organs"

Article 243

Freeze deposits, The period for remittances, securities transaction settlement funds, futures margin and other properties is six months. The maximum freezing period for each renewal period shall not exceed six months. For major and complex cases, with the approval of the person in charge of the public security organ at or above the level of a districted city, the period for freezing deposits, remittances, securities transaction settlement funds, futures margins and other property can be one year, and the maximum period for each renewal period shall not exceed One year.

"Criminal Law of the People's Republic of China"

Article 303

Gathering people together to gamble or engaging in gambling for the purpose of profit , shall be sentenced to fixed-term imprisonment of not more than three years, criminal detention or public surveillance, and shall also be fined. Anyone who opens a casino shall be sentenced to fixed-term imprisonment of not more than five years, criminal detention or surveillance, and shall also be fined; if the circumstances are serious, he shall be sentenced to fixed-term imprisonment of not less than five years but not more than 10 years, and shall also be fined. Organizing citizens of the People's Republic of China to participate in overseas (overseas) gambling, involving huge amounts or other serious circumstances, shall be punished in accordance with the provisions of the preceding paragraph.

"Procedural Regulations of the People's Republic of China and the State Public Security Bureau in Handling Criminal Cases"

Article 236

Freezing of deposits, remittances and other property The period is six months. The period for freezing bonds, stocks, fund shares and other securities is two years. If there are special reasons for extending the time limit, the public security organs shall go through the procedures for continuing the freezing period before the expiration of the freezing period. The maximum period for each renewal of the freeze on deposits, remittances and other assets shall not exceed six months; the maximum period for each renewal of the freeze on bonds, stocks, fund shares and other securities shall not exceed two years. If the freezing continues, the freezing procedures shall be re-implemented in accordance with the provisions of Article 233 of these Regulations. If the freezing procedure is not completed within the time limit, the freezing will be deemed to be automatically lifted.