One of the principle threats that is found at the internal level of airport security is passengers attempting to smuggle items aboard planes that can function as weapons. In this respect, security measures must include a list of substances that passengers are prohibited from flying with (such as chemical compounds) (Staples, no date), in addition to utilizing various devices to ensure that no is violating these rules. There are a host of technological applications that are utilized for achieving the latter objective. Most of these devices involve scanning passengers to both detect and deter them from taking potentially lethal contraband aboard planes. Metal detectors are utilized to look for typical weapons such as firearms and knives, while searches of passengers and scanning of their luggage should also be conducted to look for any prohibited materials. Other scanning devices include x-ray machines and explosive detection machines, both of which can detect the presence of substances that are not allowed on planes.

Finally, it is important to verify the identity of passengers...

In addition to merely checking international or state issued identification, the best means of fortifying Oakland International airport from threats associated with improper identification is to employ biometric scans. There is a form of technology called Computer Assisted Passenger Prescreening System that utilizes biometrics to assist the threat risk of individual passengers. The implementation of this system, or perhaps another similar to it, should effectively prevent identification threats to Oakland International Airport.
References

Staples, Edward J. (No date). "The Industrial Physicist -- Safeguarding Ports with Industrial Security." American Institute of Physics. Retrieved from http://www.aip.org/tip/INPHFA/vol-10/iss-3/p22.html.

Tyson, J., Grabianowski, E. (no date). "How Airport Security Works." How Stuff Works. Retrieved from http://science.howstuffworks.com/transport/flight/modern/airport-security4.htm