Affirmed by published opinion. Chief Judge WILKINSON wrote the opinion, in which Judge WILLIAMS and Judge TRAXLER joined.
OPINION
Winston Mitchell was convicted under 18 U.S.C. § 922(g)(9), which makes it unlawful for a person convicted of a misdemean- or crime of domestic violence to possess a firearm. He also was convicted of pos *321 sessing a silencer in violation of 26 U.S.C. § 5861(d). On appeal, Mitchell challenges his convictions on a number of grounds. Finding no merit in any of his claims, we affirm.
I.
In February-1996 appellant Winston Eugene Mitchell purchased a .38 caliber handgun in Alexandria, Virginia. A month later, Mitchell was arrested for assaulting his wife, Verlette Mitchell. On June 5, 1996, Mitchell was convicted of misdemeanor assault and battery. Mitchell and his wife continued to live together after this incident.
On September 30, 1996, Congress amended the Gun Control Act of 1968 to make it illegal for a person convicted of a misdemeanor crime of domestic violence to possess a firearm or ammunition. The amended provision states: “It shall be unlawful for any person who has been convicted in any court of a misdemeanor crime of domestic violence, to .ship or transport in interstate or foreign commerce, or possess in or affecting commerce, any firearm or ammunition; or to receive any firearm or ammunition which has been shipped or transported in interstate or foreign commerce.” 18 U.S.C. § 922(g)(9) (1994
&
Supp. IV 1998). Congress determined that the possession of a gun by one convicted of domestic violence put the possessor’s partner at undue risk.
See, e.g., United States v. Lewitzke,
On July 20, 1998, nearly two years after the enactment of § 922(g)(9), Verlette Mitchell notified the Alexandria City Police Department that her husband had threatened her. She also told the police that Mitchell possessed a handgun and a homemade silencer. She then gave the police permission to search her home in order to secure these items. That same day a warrant was issued for Mitchell’s arrest on stalking charges.
At approximately 10:30 that evening, Officers Henry and Fard arrested Mitchell outside his home. Thinking Mitchell might be armed, the officers approached him with their weapons drawn, ordered him to the ground, and handcuffed him. They .searched Mitchell for weapons and found none. Mitchell’s adult daughter, Tecinda Mitchell, emerged from the Mitchell home to see what was going on. While Officer Henry stayed with Mitchell, Fard walked onto the Mitchell porch to talk with Tecinda. Shortly thereafter, Mr. Mitchell consented to a search of his home and told Henry exactly where to find the gun. Henry relayed this information to Fard. Fard testified that Tecinda also consented to the search. Tecinda allowed Fard into the home and took him up to her parents’ bedroom. Here Fard found Mitchell’s .38 caliber handgun as well as 23 rounds of ammunition. Fard also recovered a plastic bottle stuffed with carpet padding, a device the government argues is a homemade silencer.
Oh August 5, 1998, a grand jury returned a three-count indictment against Mitchell for (1) illegally possessing a firearm in violation of § 922(g)(9), (2) illegally possessing ammunition in violation of § 922(g)(9), and (3) illegally possessing a silencer in violation of 26 U.S.C. § 5861(d) (1994). Mitchell filed a number of pretrial motions. The district court denied both his motion to dismiss the indictment as unconstitutional under the Ex Post Fac-to Clause and his motion-to suppress the items séized from the Mitchell home.
On September 29, 1998, a jury convicted Mitchell on all three counts. He was sentenced to 48 months imprisonment. Mitchell now appeals his convictions, and we address his claims in'turn.
*322 II.
A.
Mitchell first argues that § 924(a)(2) required the government to prove that Mitchell knew that possessing a firearm was illegal. We disagree. Section 924(a)(2) provides: “Whoever knowingly violates subsection [ (g) ] of section 922 shall be fined as provided in this title, imprisoned not more than 10 years, or both.” The Supreme Court has noted that “the knowledge requisite to knowing violation of a statute is factual knowledge as distinguished from knowledge of the law.”
Bryan v. United States,
The rule in
Bryan
has been applied without exception by this and other circuits when interpreting § 924(a)(2)’s application to subsection (g) firearm possession crimes.
See, e.g., United States v. Bostic,
B.
Mitchell next argues that as applied to him, § 922(g)(9) violates the Ex Post Facto Clause because both his firearm purchase and misdemeanor domestic violence conviction occurred prior to § 922(g)(9)’s enactment. See U.S. Const, art. I, § 9, cl. 3.
Again we disagree. “To fall within the ex post facto prohibition, a law must be retrospective — that is, it must apply to events occurring before its enactment— and it must disadvantage the offender affected by it by altering the definition of criminal conduct or increasing the punishment for the crime.”
Lynce v. Mathis,
Courts addressing similar ex post facto challenges to § 922(g)(9) have all agreed with this conclusion.
See, e.g., Boyd,
C.
Mitchell next contends that his conviction under § 922(g)(9) violates the Due Process Clause of the Fifth Amendment. He specifically argues that he did not have notice that his continued possession of the firearm was illegal. The statute made perfectly clear, however, that Mitchell’s possession of the firearm was unlawful. Mitchell’s pleas for particularized notice thus run headlong into the fundamental principle that “ignorance of the law is no excuse.”
See, e.g., Barlow v. United States,
Mitchell counters by arguing that his prosecution under § 922(g)(9) falls within an. exception to this maxim.
See Lambert v. California,
In the instant case, Mitchell’s conduct in assaulting his wife — the act that led to-his misdemeanor domestic violence conviction — put Mitchell on sufficient notice. This court in
United States v. Bostic
rejected an analogous due process challenge to 18 U.S.C. § 922(g)(8), which makes it unlawful for a person subject to a domestic violence protective order to possess a firearm.
III.
Mitchell further argues that the district court erred in denying his pre-trial motion to suppress items seized from his home. We hold, however, that the district court did not err by finding that Mitchell, his wife Verlette, and his adult daughter Tec-inda all independently consented to the search.
It is undisputed that Mitchell consented to the search shortly after his arrest. Mitchell, however’ argues his consent was invalid because it was the product of police duress and coercion. Whether Mitchell voluntarily consented is a question of fact which will be reversed only if after examining the totality of the circumstances, we conclude that the district court’s finding was clearly erroneous.
See, e.g., Schneckloth v. Bustamonte,
Verlette Mitchell also consented to the search earlier that day. And as she had “common authority” over the Mitchell home, her consent was valid.
See, e.g., United States v. Matlock,
IV.
Mitchell finally contends that there was insufficient evidence produced at trial for the jury to conclude that he violated 26 U.S.C. § 5861(d). Section 5861(d) makes it unlawful to possess an unregistered firearm — in this case a silencer as defined in 18 U.S.C. § 921(a)(24) (1994). When assessing the sufficiency of the evidence of a criminal conviction on direct review, “[t]he verdict of [the] jury must be sustained if there is substantial evidence, taking the view most favorable to the Government, to support it.”
Glasser v. United States,
The government’s evidence passes this threshold. Mitchell’s wife testified that Mitchell kept the device in the same bin where he kept his gun and ammunition. She also recounted seeing Mitchell put the *325 device in his fanny pack along with his gun. The government’s firearms expert testified that the device reduced gunshot noise by half. The expert also pointed out the “irregular cut in the bottom of the bottle, ... an A-type cut ... with a circular portion on the bottom.” The expert explained that the barrel and sight of Mitchell’s gun could be inserted into this cut. He concluded that in his expert opinion the device was a rudimentary, improvised firearm silencer. The testimony of these witnesses provides substantial evidence that Mitchell knew that the device had the characteristics of a silencer.
V.
For the foregoing reasons, the judgment of the district court is
AFFIRMED.
