In charge of a vehicle under influence of drugs

Convicted Driver Insurance
Hi my son was charged roadside on June 2nd last year and taken to station blood test done and charged being in charge of a vehicle after smoking cannabis. He has just received papers today (as 1 year to serve in Scotland just now due to covid) is there anything at all that can be done so he doesn't lose his licence as his job involves driving daily 🙈. His keys weren't in ignition at time he was charged
 
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