The prohibitive rarely if ever uses preverbal NEG only. The prohibitive thus has either a double negation (NEG + V + NEG) or postverbal negation (V + NEG).
This situation is contrary to declarative negatives, where all three NEG patterns can occur, i.e.
NEG + V
NEG + V+ NEG
V + NEG
Source: Schwegler and Green 2007: 287