Casinos use a combination of advanced technology and surveillance methods to detect card counters. High-resolution cameras and facial recognition systems help identify players who are known to count cards, while surveillance teams monitor betting patterns for signs of advantage play. Player tracking systems, such as cards that log wagers, provide insight into betting behavior, allowing casinos to flag unusual betting activity. Additionally, data analytics software can analyze these behaviors in real-time, looking for anomalies that suggest card counting. Shuffling machines and shoe monitoring systems help prevent counters from exploiting deck compositions, while AI and machine learning offer further detection capabilities. Finally, human observation complements these technologies, as staff watch for suspicious behaviors that indicate a player might be counting cards. Together, these systems make it challenging for card counters to go undetected.