I'm making a "Spectator Machine" and I need help with detecting if a player is holding a redstone block to return back to their original spot, Im in Minecraft Bedrock and I still don't know if I should use /testfor or /execute and I don't know which one works.

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    I strongly suspect that this would require an NBT check, like in MCJava, so it would be impossible in MCPE. But who knows, maybe they have some other feature for that. – Fabian Röling Dec 21 '19 at 15:13

It is impossible to detect what block a player is holding unlike tools, what you could do instead is use tags.

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