Little has changed at airport security checkpoints since the 2001 terrorist attacks -- despite government plans to develop advanced technology that could detect explosives, weapons or suspicious individuals. Experts and government officials say the lack of new technology leaves aviation vulnerable to terrorism. TSA officials have said the slow developments are due to limited investment in security, and the security industry has cited a lack of federal funding and a difficult approval process. In the next few months, the TSA is expected to spend millions on new equipment, which is the first substantial investment in checkpoint security technology since the 1970s.
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