text: _________________________________________________________________________________FM 2-22.3
  ONE-TIME CONTACT
  5-7. The one-time contact is a source of information of value that was, and
  will be, encountered only once. In all operational environments the HUMINT
  collector will frequently encounter a source only once, particularly at lower
  echelons. This may be a local civilian encountered during a patrol, a detainee
  who is quickly questioned and then evacuated, or a refugee at a checkpoint.
  5-8. In addition to the information obtained from a one-time contact, the
  HUMINT collector must make a reasonable effort to obtain as much basic
  data as possible about the one-time contact. Complete name, occupation,
  address, and other basic data of this source are crucial for a thorough
  analysis of the information provided. The one-time contact and the
  information he provides cannot be assessed and evaluated independently;
  however, the information provided by a one-time contact must be reported
  and corroborated through other HUMINT sources and even other intelligence
  disciplines.
  5-9. Contact reports must be filed with the OMT and source registries
  maintained in accordance with FM 34-5 (S//NF), AR 381-100 (S//NF), and
  DIAM 58-11 (S//NF) in order to support analysis of information obtained. If a
  one-time contact is encountered for a second time and again provides
  information of value, then the contact may be thereafter treated as a
  continuous contact.
  5-10. A walk-in is a one-time contact who volunteers information of value to
  US forces on his own initiative. The walk-in source may volunteer
  information by approaching an HCT, other ISR elements, or US forces or
  civilian personnel anywhere in the AO. Each unit must have in place a
  program to identify, safeguard, and direct the walk-in to the appropriate
  collection asset, to be screened and debriefed as required. For example, a
  walk-in who wanted to report a crime would be directed to the PMO rather
  than to a HUMINT collector.
  5-11. The collection asset will screen the walk-in to determine the type of
  information the source has and to determine and evaluate the reliability of
  the individual. After identifying the type of information, the collector
  determines if he has the jurisdiction to collect that information. If, for
  example, the walk-in wishes to report a crime, the collector refers that
  individual to the proper criminal investigative agency.
  5-12. Systematic questioning, deception detection techniques, and cross­
  checking of information are used extensively in the evaluation process.
  Concurrently, there are national level directives, DOD directives, and Army
  regulations that direct specific actions to be taken with a walk-in. When
  dealing with a walk-in source, HUMINT collectors must guard against
  adversary intelligence collection. They must also protect legitimate sources of
  information. The walk-in is thoroughly debriefed on all areas of information
  relevant to collection requirements, and any information of value is reported.
  5-13. On occasion, the HUMINT collector may determine that a one-time
  contact has the potential to become a continuous contact or a formal contact.
  This is referred to as a developmental lead. A developmental lead is an