Legal analysis: fifteen days' detention for fighting with others will not affect the future, but will leave a criminal record. Just correct it later. Detention for fifteen days belongs to public security management punishment. The punishment of public security management must be based on facts, which is equivalent to the nature, circumstances and social harm of the violation of public security management. The implementation of public security management punishment should be open and fair, respect and protect human rights, and protect the personal dignity of citizens.

Legal basis: Article 5 of the Law of People's Republic of China (PRC) on Public Security Administration Punishment must be based on facts, which is equivalent to the nature, circumstances and social harm of acts violating public security administration. The implementation of public security management punishment should be open and fair, respect and protect human rights, and protect the personal dignity of citizens. Handling public security cases should adhere to the principle of combining education with punishment.