Your friend is now in criminal detention. According to the provisions of Article 69 of the Criminal Procedure Law of People's Republic of China (PRC), a criminal suspect who commits a crime on the run, commits a crime in a gang or commits a crime repeatedly may be detained for 30 days. Therefore, the longest time for the public security organ to detain your friend is 30 days, and then it will ask the procuratorate whether to arrest him. If the procuratorate thinks it is necessary to arrest, then your friend will be arrested. If there is no need for arrest, it can be released. The time for examination by the procuratorate is seven days. In other words, the results can be seen after 37 days at most from the date of criminal detention. If you can let it out, there will be nothing. If you can't let it out, you will be prosecuted by the procuratorate and sentenced to jail. You will have the result in ten days at most. The public security organ informs your friend's family that he is under criminal detention, and will also inform him if he is arrested.
If your friend is really suspected of drug trafficking, it's really hurting others and yourself!