(ShareCast News) - Digital Barriers has secured another TVI surveillance contract with a major US federal law enforcement agency worth $1.2m (£0.79m), the company announced Wednesday.It follows on from its announcement last Thursday about two contracts worth $1.1m (£0.72m), one of which is with the same agency.The contract will see Digital Barriers supply additional TVI surveillance solutions to the agency and is expected to be fully recognised this financial year and lead to material follow-on contracts.Chief executive Zak Doffman said the additional contract underpins the company's confidence in the potential of TVI to achieve widespread adoption across major law enforcement agencies around the world."TVI is now a firmly-proven and highly-differentiated technology, which materially outperforms its competition in trials and demonstrations, and, much more importantly, in real-world deployments."Shares in the AIM-listed company were up 4p on the news to 48.5p per share.