There are plenty of security plays these days

— -- Q: Is there a way to invest in technology companies that profit from the increased demand for surveillance, weapon detection and security cameras?

A: Ever since the terrorist attacks rocked the nation, companies, institutions and individuals have looked at surveillance very differently.

Security has been beefed up most obviously in airports, but also in office buildings, day care centers and in some homes. This increased awareness of security was a popular theme for investors immediately after the terrorist attacks. USA TODAY in 2001 pointed out how investors almost immediately surged into shares of security stocks.