7 Interrogations: Which Sabbatical-Cycle, Year of the Cycle, Month, Date of the Month, Day of the Week, Hour, and Place: Pesachim 12a
What happens should one say "I Don't Know" to one of the seven interrogations; whether we require testimony which can be established as false based on the time and place it was in: Pesachim 12a
Whether more fine cross-examination [Derishah] is used: Sanhedrin 2b-3a
What happens should they say "I Don't Know" to more fine cross-examination: Pesachim 12a