Old Soldier wrote:
'silence, in the end, could incriminate you'.

absolutely correct! Which is why I wrote:
'don't try and convince them you are innocent unless it's provable'.
If it is provable; tell them everything useful to yourself. As I wrote in the second post on this thread.

Virtually everything else he wrote is wrong I'm afraid. You can't be kept and handcuffed without being arrested. You can't be charged with 'harbouring information' by keeping silent.
The Sock
_________________________
The world is in haste and nears its end – Wulfstan II Archbishop of York 1014.