In the past, we've copy and pasted the roll in the game's OOC and everyone's verified that. You can type in a person's name and ID number and it will give you their roll history. So, if you are worried that they maybe rolled to get the best roll, it will tell you how many rolls, etc.
Have them include all the information, IE what game the roll is for, the variables necessary and it will log it for them.
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Roll Result: Chelemar rolled: 1d6, keeping 3 dice, adding 2to the total
Comment: For shadow