Not since false negatives are the biggest issue. For companies that use this software keeping porn and viruses off the network is a higher priority than letting

Not since false negatives are the biggest issue. For companies that use this software keeping porn and viruses off the network is a higher priority than letting charity donation pages through. These companies have never little trust in their employees. A flip side of this is a lack of respect. Blocking none work related sites is an acceptable if not desirable result.