In some states, it is possible to file a joint motion with the prosecution asking the criminal court for a stipulated and amended sentence order that amends the record of conviction to specify the actual amount of marijuana to be less than 30 grams. This has been effective in immigration court to qualify the conviction for the exception to the controlled substances deportation ground and should also be effective in qualifying the conviction for a waiver of inadmissibility under INA 212(h). Thanks to Jeff Joseph.