Possible Clues:

• Nonscientific, as evidence
• 'Is the cane broken at the point, Al? That'd be telling (9)'
• Based on hearsay
• Unreliable obsessive hiding cryptic code finally left
• Like slightly unreliable report or hearsay
• Deriving from unreliable hearsay
• Like stories a lad once told primarily when travelling
• Not fully reliable, as evidence
• Strange tale on a CD's untrustworthy as evidence
• Article located in ruins? That's hearsay