Records relating to a case charged in criminal court can be expunged by the court immediately following termination of the case in favor of the accused as defined in section 4372. 11 Del. C. § 4374.
Ineligible Category or Citation
Offenses under Title 21 (Motor Vehicles) except those listed in section 4374(g)(2) are ineligible for expungement.
The petition must be filed in the Criminal Division of the Superior Court in the county where the case was terminated and must include a copy of state criminal history. For the specific procedure, see 11 Del. C. § 4374.
The person need not disclose the arrest for any reason, except to criminal justice agencies. 10 Del. C. § 1027(e). In response to inquiries from anyone other than a law enforcement officer, courts and police agencies will reply that there is no record. 10 Del. C. §§ 1025(e)(5), 1027.
A list of forms regarding expungement in Delaware can be found here. http://courts.delaware.gov/forms/list.aspx?sec=Forms&ag=All%20Courts&sub=Expungement%20of%20Criminal%20Records
There is no statutory language regarding a waiting period.