Reply #285: From the Privacy Act of 1974:

[MajorChode]

(b) Conditions of disclosure

No agency shall disclose any record which is contained in a system of records by any means of communication to any person, or to another agency, except pursuant to a written request by, or with the prior written consent of, the individual to whom the record pertains, unless disclosure of the record would be--
...
(7) to another agency or to an instrumentality of any governmental jurisdiction within or under the control of the United States for a civil or criminal law enforcement activity if the activity is authorized by law, and if the head of the agency or instrumentality has made a written request to the agency which maintains the record specifying the particular portion desired and the law enforcement activity for which the record is sought;

http://www.justice.gov/opcl/privstat.htm

Most states have privacy laws that mirror the federal law. I have no idea what they are in the state of Missouri, but I would be surprised if there wasn't a similar exclusion for law enforcement activities.