Security Ledger Publisher & Editor in Chief Paul Roberts speaks with Mark Loveless, aka "Simple Nomad," a senior security researcher at the firm DUO Security about the recent hack of more than 100 civil defense sirens in Dallas, Texas. A security researcher at the firm DUO Security - and a Texas resident - Loveless penned a blog post that raises questions about the official account of the incident and whether some element of computer intrusion may have played a part in the incident, which lasted close to two hours. Loveless notes that software based systems are not part and parcel of civil defense and emergency response apparatus. These systems, frequently, are poorly secured and vulnerable to remote, software based tampering.