Miguel Ontiveros, 1 a.k.a. Luis Alberto Erenas-Luna, a.k.a. Miguel OntiverosMu-rillo, appeals his conviction for conspiring to distribute methamphetamine. The sole issue is whether the district court erred by denying Ontiveros’s motion to dismiss for unconstitutional post-indictment delay. We vacate the district court’s order denying Ontiveros’s motion to dismiss and remand for further proceedings consistent with this opinion.
I.
In April 2003, police in Grand Island, Nebraska, arrested Ontiveros on an outstanding warrant. Police searched On-tiveros’s home and found evidence related to a drug conspiracy. Because Ontiveros, a Mexican citizen, was an undocumented alien, police contacted federal immigration authorities. Immigration authorities took custody of Ontiveros and, on April 21, 2003, had him deported. In early June 2003, a confidential informant notified a Grand Island police officer that Ontiveros had returned to the United States and was in Lincoln, Nebraska. The officer *775 contacted authorities in Lincoln who verified seeing someone matching Ontiveros’s description at the home where the informant reported that Ontiveros was staying.
On July 24, 2003, approximately three months after his arrest and deportation, a federal grand jury indicted Ontiveros for conspiring to distribute methamphetamine. For wider-investigation purposes, the government sealed the indictment. U.S. Marshals sent a copy of Ontiveros’s federal arrest warrant to the Grand Island Police Department. They also informed FBI agents in the Grand Island area that a warrant had been issued for Ontiveros’s arrest.
Pursuant to a thirty-day waiting policy, the Grand Island police did not immediately forward Ontiveros’s arrest-warrant information to the FBI to enter into the National Crime Information Center (“NCIC”) database. 2 According to the evidence, FBI agents and U.S. Marshals aware of the warrant also made no effort to enter the data. Moreover, despite the arrest warrant, knowledge of Ontiveros’s contacts in Nebraska, Arizona, and Mexico, and a late-September 2003 tip from an informant stating that Ontiveros had been in Grand Island within the previous month, it appears no federal or state authorities made any attempt to locate and arrest Ontiveros.
According to police testimony, by the end of 2003, Ontiveros’s case had inexplicably “slipped through the cracks” such that no one actively searched for Ontiveros or realized his information was not in the NCIC database. As a result, when immigration and border-control officials apprehended Ontiveros on multiple occasions in 2004, they remained unaware of Ontive-ros’s arrest warrant and did not take him into custody.
In February 2006, an FBI agent reviewing fugitive listings in Grand Island discovered Ontiveros’s omission from the NCIC database and entered Ontiveros’s arrest-warrant information. Approximately four months later, in June 2006, Arizona police arrested Ontiveros on separate drug charges and discovered Ontiveros’s outstanding arrest warrant on the NCIC. The Arizona police then notified Nebraska officials of Ontiveros’s whereabouts. Nebraska FBI agents arranged for Arizona FBI agents to detain Ontiveros at a court appearance and, in July 2006, pursuant to a court order, had him transported to Nebraska. According to the district court’s findings, Ontiveros first learned of the pending Nebraska drug charge when the Arizona FBI detained him.
After Ontiveros returned to Nebraska, the district court arraigned Ontiveros and unsealed the July 2003 indictment. On-tiveros moved to dismiss the charge for unconstitutional post-indictment delay. A magistrate judge held a hearing on the matter and filed a report and recommendation that the district court deny the motion. Over Ontiveros’s objections to the report and recommendation, the district court adopted the magistrate judge’s findings and denied Ontiveros’s motion.
In August 2007, Ontiveros proceeded to trial. A jury found Ontiveros guilty. Following his sentencing, Ontiveros filed a timely notice of appeal.
II.
Ontiveros argues that the district court erred in rejecting his claim that the
*776
government violated his Sixth Amendment right to a speedy trial. U.S. Const, amend. VI. “We review the district court’s findings of fact on whether a defendant’s right to a speedy trial was violated for clear error but review its legal conclusions de novo.”
United States v. Aldaco,
The government concedes that the delay in this case was presumptively prejudicial such that we must apply the four-factor-balancing test set forth in
Barker v. Wingo
to evaluate Ontiveros’s claim.
Barker v. Wingo,
A.
Under the first
Barker
factor, we consider the length of delay. This factor requires a “double inquiry”: (1) whether the length of delay was presumptively prejudicial such that it triggers the
Barker
analysis, and, if triggered, (2) “the extent to which the delay stretches beyond the bare minimum needed to trigger judicial examination of the claim.”
United States v. McGhee,
The Sixth Amendment right to a speedy trial “attaches at the time of arrest or indictment, whichever comes first, and continues until the trial commences.”
McGhee,
In
Walker,
a drug-conspiracy case, we applied
Barker
and held under the first factor that a 37-month post-indictment delay between indictment and arraignment weighed in the defendant’s favor.
Walker,
In attempt to distinguish Walker, however, the government notes that the district court suggested that the delay in this case might be calculated more accurately as only 17 to 28 months, measuring from the times when immigration officials had Ontiveros in custody in March 2004 and December 2004 3 to the time when Ontive-ros was arraigned in July 2006. According to the court, those measurements may have been more accurate because authori *777 ties likely would not have been successful in locating Ontiveros prior to that time, even if they had tried. We reject that conclusion because it is speculative at best. It also considers responsibility for the delay, which is a matter we consider in the second Barker factor. For these reasons, we agree with the district court that the first Barker factor weighs in Ontiveros’s favor.
B.
Under the second
Barker
factor, we consider the reasons for the delay and evaluate “whether the government or the criminal defendant is more to blame.”
Doggett v. United States,
Here, the district court found no evidence that the government intentionally delayed Ontiveros’s trial. It concluded, however, that the government was “clearly seriously negligent” for failing to take appropriate actions to attempt to apprehend Ontiveros in a timely manner. Conversely, the district court found no evidence that Ontiveros knew of the indictment prior to July 2006 and, accordingly, that Ontiveros was not responsible for the delay in his arrest. The district court ultimately found that this Barker factor “weighted] decidedly against the government.”
In
Doggett,
the Supreme Court instructed us to accord “ ‘special deference’ [to a] district court’s determination concerning whether the government was negligent.”
Walker,
We also find no reason to disagree with the district court’s conclusion that Ontive-ros was unaware of the indictment prior to July 2006 and, thus, deserved no blame for the delay before that point. It is undisputed that the indictment in question was sealed until July 2006. Moreover, as the government notes, Ontiveros told Arizona FBI agents when he was arrested that he would not have appeared in Arizona court had he known of the Nebraska indictment. Ontiveros did, however, appear in Arizona court and, over the three-year delay, placed himself in multiple situations that could have led to his arrest on the Nebraska drug charge. Under a clear-error standard, this lends sufficient support to the *778 district court’s factual conclusion that On-tiveros was unaware of the pending indictment and had no responsibility for the three-year delay between his indictment and arrest.
Finally, as to the time between Ontive-ros’s arrest and trial, that delay was largely due to Ontiveros’s own motions. Thus, we cannot attribute this delay to government negligence.
See McGhee,
C.
The third
Barker
factor considers “whether in due course the defendant asserted his right to a speedy trial.”
Walker,
Focusing its analysis on the three-year delay between Ontiveros’s indictment and arraignment, the district court found this factor to be neutral because “[t]here [was] no evidence [Ontiveros] knew, should have known, or could have known of the indictment filed against him on July 24, 2003.” While the government agrees with this finding, Ontiveros argues that this factor should weigh in his favor because he raised his claim after his arrest. We disagree with Ontiveros’s position.
Because the delay in this case for which the government was responsible predated Ontiveros’s arrest, Ontiveros’s post-arrest assertion of his speedy-trial right has little bearing on his claim. Under similar circumstances in
Doggett,
the Supreme Court did not weigh- a defendant’s post-arrest assertion of his speedy-trial rights in the defendant’s favor. Instead, the Court stated only that the defendant “[was] not to be taxed for invoking his speedy trial right only after his arrest.”
Doggett,
D.
The final
Barker
factor considers “whether the defendant suffered prejudice as a result of the delay.”
Walker,
The extent to which a defendant must demonstrate prejudice under this factor depends on the particular circumstances. A showing of actual prejudice is required if the government exercised rea
*779
sonable diligence in pursuing the defendant.
Doggett,
As to actual prejudice, we agree with the district court that Ontiveros’s vague claims regarding witness memory loss and lost opportunities to cooperate with the government are insufficient, without more, to satisfy his burden.
See Doggett,
We disagree, however, with the district court’s finding that it could not presume prejudice. In
Doggett,
the Supreme Court held that, under the Sixth Amendment, “prejudice is not limited to the specifically demonstrable, and ... affirmative proof of particularized prejudice is not essential to every speedy trial claim.”
Doggett,
Citing a Fifth Circuit case, the district court refused to presume prejudice because it found “courts have generally found presumed prejudice ... only in cases in which the post-indictment delay lasted at least five years.”
See United States v. Serna-Villarreal,
Here, due to the serious negligence of the government, there was a three-year delay between Ontiveros’s indictment and arraignment. Three years is a time well in excess of that required to trigger a
Barker
review.
See Doggett, 505
U.S. at 657-58,
Although the delay in this case is shorter than the delay at issue in
Doggett,
we believe
Doggett’s
instruction to vary the weight assigned to the presumption according to the government’s negligence and the length of delay sufficiently contemplates this difference.
See United States v. Smith,
III.
Because the district court failed to apply any presumption of prejudice under the fourth
Barker
factor, we remand the case for further proceedings with orders to apply an appropriate presumption in Ontiveros’s favor. The district court should then allow the government an opportunity to rebut the presumption.
See Doggett, 505
U.S. at 658,
For the foregoing reasons, we vacate the district court’s order denying Ontiveros’s motion to dismiss and remand for further proceedings consistent with this opinion.
Notes
. The appellant refers to himself as Miguel Ontiveros. We respect appellant’s preference and refer to him as Ontiveros throughout this opinion.
. The NCIC database is an FBI-controlled national database that contains information for recent and outstanding arrest warrants. Both federal and state law-enforcement officers, including immigration authorities, can access the system to determine whether a person has outstanding arrest warrants.
. We note that the correct measurement from December 2004 to July 2006 would be 19 months, not 17.
