The panel is now out for half an hour deciding whether to pursue the causation issue.
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For months, the couple watched their only son grow up in videos while he was kept in US government custody.
Maarten Peter Pieterse, 59, and Emile Adriaan Jeroen Schoemaker, 44 were remanded into custody to appear before Bristol Crown Court next mon
The current design, which features wide gaps between its distinctive triangular chunks, was met with dismay when it was introduced in 2016.