State v. Arnold
In State v. Arnold, 2003 WL 23112735 (Del. Com. Pl. 2003) the Court ruled that an officer could not lay a proper foundation for the admission of Intoxilyzer certification sheets, under D.R.E. Rule 803(6).
In Arnold, the Officer did not know how the test was performed, did not know anything about the contemporaneous recording of the sheets, never saw the chemist sign the sheet, and never witnessed an actual certification procedure, but was only told that the chemist performed a certain test.