On the morning of September 2, 2007, officers of the Fairview Heights Police Department arrested Kenneth Kirkland after a search of his vehicle revealed crack cocaine. On September 4, Kirkland was transferred to the custody of the Drug Enforcement Agency. While in DEA custody, Kirkland made several inculpatory remarks, and he was arraigned later that afternoon. On April 30, 2008, Kirkland was convicted of possession with intent to distribute fifty grams or more of cocaine base. He now appeals, arguing that his statements to DEA agents were inadmissible under Federal Rule of Criminal Procedure 5(a), 18 U.S.C. § 3501(c), and the Fourth Amendment. Because defense counsel did not adequately develop these arguments in the district court, Kirkland has forfeited his right to appeal these issues, and his conviction will be affirmed.
I. Background
In the early morning hours of September 2, 2007, Fairview Heights police responded to a report of suspicious activity related to Kenneth Kirkland at the Ramada Inn. A drug detection dog brought to the scene conducted an exterior “sniff’ of Kirkland’s vehicle and alerted to the presence of controlled substances. After the positive alert, police continued to monitor the hotel and Kirkland’s vehicle.
As Kirkland left the Ramada Inn later that morning, Officer Brian Rogers stopped him for driving with a cracked windshield and failing to wear his seatbelt. After Rogers asked Kirkland some initial questions and issued him a warning for the traffic violations, Sergeant Mike Origliosso and DEA Task Force Officer (“TFO”) Chris Modrusic arrived at the scene. Without notifying Kirkland of his rights, Rogers asked Kirkland to step out of the vehicle, told him he was free to leave, and asked if he would answer some questions. Kirkland agreed and gave consent for Rogers, Origliosso, and Modrusic to search the vehicle. The search revealed rifle cartridges and crack cocaine.
Kirkland was arrested at around 10:00 that morning. He was held in police custody until he was transferred to the DEA’s office on the morning of September 4, approximately forty-eight hours later. TFO Mark Rigel read Kirkland his Miranda rights, and Kirkland agreed to speak with him. 1 When Rigel asked if Kirkland wanted to make a written statement, Kirkland responded that he would accept responsibility for the cocaine. Kirkland was arraigned before a magistrate judge at approximately 3:00 p.m. that afternoon. He was later indicted for possession with intent to distribute fifty grams or more of a mixture or substance containing cocaine base, in violation of 21 U.S.C. § 841(a)(1).
On November 30, Kirkland filed a motion to suppress “certain evidence in this matter.” After reciting the events that occurred while in the custody of the Fair-view Police Department, Kirkland claimed that his detention was “unreasonable, illegal, unlawful and unconstitutional.” Specifically, he claimed that the length of the detention was constitutionally unreasonable and that the police violated the *319 Fourth Amendment by detaining him without a reasonable articulable suspicion that he was involved in criminal activity. He also argued that the interrogation roadside was coercive and conducted before he was advised of his constitutional rights under Miranda. He claimed that all subsequent statements and admissions were thus tainted by this illegal conduct.
On February 1, 2008, Kirkland filed a memorandum in support of this motion, in which he repeated his Fourth Amendment argument and requested that the seized crack be suppressed. Conspicuously absent from both the motion and memorandum was any mention whatsoever of the DEA or Kirkland’s statements to TFO Rigel.
On February 28, the court held a suppression hearing. Defense counsel repeated the arguments made in his motion and memorandum and added:
Regarding the statements that he ultimately makes at the DEA office several days later, I believe those warrant suppression as well, Your Honor, based upon the fact that he had been in custody for over 48 hours at that point, apparently had not even had a change of clothing. My understanding is that he was brought to Court later that day, but not before being interviewed at the DEA office.
The District Court issued an order on April 15. The court declined to suppress the physical evidence because the search was supported by probable cause and was consensual. However, it held that any statements made at the side of the road were in violation of Miranda. In deciding which statements to suppress, the district court noted:
[I]n his motion, Kirkland does not specify which particular statements were unconstitutionally obtained, and this Court “need not try to fish a gold coin from a bucket of mud” in determining which specific statements Kirkland intends to challenge. United States ex rel. Garst v. Lockheed-Martin Corp.,328 F.3d 374 , 378 (7th Cir.2003). Nonetheless, at the hearing, Kirkland referred specifically to statements he made at the scene ... as well as the September 4, 2007[,] statement he made to Officer Rigel.
United States v. Kirkland,
No. 07-CR-30137,
On April 30, following a jury trial, Kirkland was convicted. On September 19, he was sentenced to 240 months’ imprisonment and ten years’ supervised release.
II. Analysis
On appeal, Kirkland argues that he was held for an unreasonable amount of time prior to being brought before a magistrate for a probable cause determination. The Fourth Amendment requires that a defendant receive a judicial determination of probable cause promptly after arrest or detention.
Gerstein v. Pugh,
*320
Similarly, Rule 5(a) of the Federal Rules of Criminal Procedure requires that a person arrested on a federal charge be presented to a magistrate judge “without unnecessary delay.” Even given a delay in presentment, however, a voluntary confession made within six hours of arrest remains admissible. 18 U.S.C. § 3501(c). On the other hand, a voluntary confession made after the six-hour safe-harbor period may be inadmissible as a Rule 5(a) violation and pursuant to
McNabb v. United States,
Time spent in state custody does not generally count toward § 3501(c)’s six-hour limitation.
United States v. Carter,
Kirkland claims that the district court erred in failing to suppress his confession to TFO Rigel. He argues that his extended detention before presentment to a magistrate judge violated Rule 5(a), § 3501(c), and the McNabb-Mallory line of cases because TFO Modrusic’s involvement in the state investigation constituted a collusive working arrangement between federal and state authorities. 2 He also claims that the length of time he spent in custody before receiving a probable cause determination' — over forty-eight hours — violated the Fourth Amendment under Riverside. For the reasons that follow, we find that Kirkland has forfeited his right to raise these issues on appeal.
It is well established that a criminal defendant seeking to suppress evidence must do so prior to trial.
See
Fed. R.Crim.P. 12(b)(3)(C);
United States v. Brodie,
Under ordinary circumstances, waiver precludes appellate review alto
*321
gether, whereas we review a forfeited issue for plain error.
Id.
A forfeited suppression argument presents a special situation because, under Rule 12(e), “the defendant must first show good cause for failing to make that argument in the district court” before we may review it.
United States v. Murdock,
Not only must the defendant move to suppress evidence to preserve an issue for appeal, but he also must identify the grounds upon which he believes suppression is warranted.
United States v. Pope,
Near the end of the suppression hearing, defense counsel requested for the first time that the court suppress Kirkland’s statements to the DEA. He noted that Kirkland had been in custody for more than forty-eight hours without a change of clothing. He also stated that Kirkland had been brought before the court later that day, but not before being interviewed at the DEA office. In this context, he did not mention the Fourth Amendment,
Riverside,
Rule 5(a), § 3501(c),
McNabb, Mallory,
or a “working arrangement” between federal and state officials. In other words, he failed to develop the argument with citation to any relevant authority or meaningful discussion. Such a failure results in forfeiture,
see Jarrard v. CDI Telecomm., Inc.,
We do not demand that a defendant’s argument be a “model[ ] of trial advocacy” to avoid forfeiture.
United States v. Roque-Espinoza,
Perhaps in hindsight we can discern a plausible connection between defense counsel’s comments and the grounds Kirkland now raises on appeal. After all, counsel did mention the forty-eight-hour detention and the fact that Kirkland had not been brought before the court prior to the interview at the DEA office. But these comments could just as easily have been directed to the argument in Kirkland’s suppression motion that his statement was involuntary. Courts “are not in the business of formulating arguments for the parties,”
United States v. McClellan,
Finally, we also note that defense counsel’s perfunctory comments were untimely. The district court set a November 28, 2007, deadline for Kirkland’s suppression motions, and Kirkland’s final reply brief was due on January 25, 2008. Yet Kirkland did not mention the statement to the DEA until his suppression hearing on February 28. Not only must the defendant raise a suppression motion prior to trial to avoid waiver or forfeiture, but he must also comply with any timing requirements set by the district court. Fed. R.Crim.P. 12(c);
see United States v. Mancillas,
III. Conclusion
Defense counsel’s comments at the sentencing hearing were not sufficiently developed to preserve the issues Kirkland now raises on appeal. Kirkland has therefore forfeited his right to appeal these issues under Rule 12(e). We Affirm the judgment of the district court.
Notes
. The precise timing of Kirkland’s arrest and transfer to the DEA office is unclear. The warning ticket was issued at 9:31 a.m. on September 2, and the search and arrest followed. Rigel’s interview of Kirkland began at 10:10 a.m. on September 4, but it is unclear how long Kirkland had been at the DEA office. Although this time frame would be relevant to the forty-eight-hour window under
County of Riverside v. McLaughlin,
. We note that at oral argument, Kirkland conceded that he had forfeited this issue. However, neither of his briefs makes such a concession. Considering that Kirkland’s briefs both contain a lengthy Rule 5(a) discussion and that our analysis of this issue is parallel to the Fourth Amendment inquiry, we will discuss Kirkland’s forfeiture of both issues together.
