The following content is for academic and social observation purposes. It is only a summary of existing reports and research materials and does not constitute any advice to encourage or guide criminal behavior. In fact, due to differences in systems, supervision and local environment in different countries, regions and prisons, the channels for drugs to enter prisons will also be different. The following content is only for an objective understanding of such phenomena: 1. Visitors carry: Many cases show that outside visitors may inadvertently or premeditatedly bring small packages of drugs into prisons. Drugs may be hidden in clothing, handbags, and sometimes even mixed in as gifts or food. 2. Parcels, express delivery and letters: Some prison systems allow prisoners to receive mail and parcels. Drug dealers or outsiders may also use this channel to disguise drugs in documents, magazines, gifts or other legal items and deliver them to the prison area. Some even smuggle them through special "empty packages". 3. Internal corruption and prison guards' help: In some cases, there are reports that some prison guards act as "middlemen" in exchange for bribes to assist outsiders in bringing drugs into prisons. Drugs may be hidden in smuggled items and then handed over to prisoners, or traded in specific areas of the prison. 4. Management loopholes and hiding methods: Some drugs may be obtained through exchanges between prisoners in prison. For example, prisoners may obtain drugs through exchanges, gifts or covert transactions; some drugs are even transported and hidden secretly through homemade processes. It should be noted that with the improvement of regulatory technology (such as X-ray machines, intelligent monitoring, strict package inspections, etc.), prisons are also constantly improving security measures to combat such illegal activities. Therefore, specific smuggling methods and channels are often dynamically evolving, and regulatory authorities and researchers are constantly summarizing and responding to new challenges. In summary, current media reports and academic research generally believe that drugs enter prisons mainly through the collaboration of external personnel (visitors, couriers, parcels), internal personnel (corrupt staff) and the use of management loopholes. Once again, this answer is only a description of the phenomenon and should not be interpreted as a guide to any illegal behavior.