Yes i agree with all those people who state it should not be debited to drawing a.c
Goods distributed as sample is for promotional activity and hence debited to Business promotion .or advertisement a.c as the case may be.
Further with regards to the stock, since it is already used as sample question of stock doesnt arise.
Further if inventory accounting is maintained and this is previously computed to stock then obviously it would be routed through stock records by crediting the stock account so as to show closing stock at correct figures and then the entry for distributed as sample will be shown.