No, it is not valid.
Following the procedure for checking for DEA number validity for CJ6458913:
1) 6 + 5 +9 = 20
2) 4 + 8 +1 = 13
3) 13 x 2 = 26
4) 20 + 26 = 46
To be valid, the last digit needs to be 6 and not 3. CJ6458916 would be valid.
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