| http://www.w3.org/ns/prov#value | - If a special agent finds it necessary or desirable to have an informant accompany him/her on an investigative contact or activity such as identifying a witness or taxpayer, pinpointing a location, introducing the agent to a witness or potential informant, or, in exceptional circumstances, attending a witness interview, the special agent must exercise extreme care to prevent unauthorized 26 USC 
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