tially outweighed by the danger of unfair prejudice, confusion of the issues, or misleading the jury, or by considerations of undue delay, waste of time, or needless presentation of cumulative evidence.
As we have repeatedly held, the decision whether to admit evidence under this rule is one left to the sound discretion of the trial court. We will not upset such a decision except under “the most ‘extraordinary’ of circumstances,” where that discretion has been plainly abused.
United States v. Heyward, 729 F.2d 297, 301 n. 2 (4th Cir.1984), ce
rt. denied, 469 U.S. 1105, 105 S.Ct. 776, 83 L.Ed.2d 772 (1985) (quotation omitted),
cited in United States v. Tindle, 808 F.2d 319, 327 n. 6 (4th Cir.1986),
later appeal, 860 F.2d 125 (4th Cir.1988),
cert. denied, — U.S.-, 109 S.Ct. 3176, 104 L.Ed.2d 1038 (1989). Such an abuse occurs only when it can be said that the trial court acted “arbitrarily” or “irrationally” in admitting evidence.
United States v. Masters, 622 F.2d 83, 88 (4th Cir.1980);
Garraghty v. Jordan, 830 F.2d 1295, 1298 (4th Cir.1987).
This broadly deferential standard makes clear that we are reluctant to question a trial court’s judgment under Rule 403, and for good reason. “Trial judges are much closer to the pulse of a trial than ... [we] can ever be [and] ‘broad discretion’ is necessarily accorded them.” Tindle, 808 F.2d at 327 n. 6, quoting United States v. Juarez, 561 F.2d 65, 71 (7th Cir.1977); see also Morley v. Cohen, 888 F.2d 1006, 1011 (4th Cir.1989) (appellate review of Rule 403 decision demands judicial self-restraint). Nonetheless, when, after review of the record, we are left with a firm conviction that an abuse of discretion has occurred that has worked to the prejudice of a defendant, we must reverse. We find that the trial court’s admission of the testimony concerning the drug courier profile and the marijuana residue (“drug courier” testimony) was such an abuse of discretion.
In reaching this conclusion, we are mindful of the strong preference for admitting probative evidence, and that, in reviewing the trial court’s decision, we must “look at the evidence in a light most favorable to its proponent, maximizing its probative value and minimizing its prejudicial effect.” Mullen v. Princess Anne Volunteer Fire Co., Inc., 853 F.2d 1130, 1135 (4th Cir.1988). In this regard, the government argues that the probative value of the drug courier testimony is high because it shows that appellant meets the drug courier profile and, therefore, tends to show that he is a courier. Consequently, the government maintains it also tends to show that appellant might have had a motive for carrying a gun. Simply to state this argument reveals its tenuity.
When coupled with other corroborating circumstances, the drug courier profile is a powerful investigative tool used,
inter alia, to develop reasonable suspicion to support a
Terry stop
(Terry v. Ohio, 392 U.S. 1, 88 S.Ct. 1868, 20 L.Ed.2d 889 (1968)) of a suspected drug trafficker.
See Reid v. Georgia, 448 U.S. 438, 439-41, 100 S.Ct. 2752, 2753-54, 65 L.Ed.2d 890 (1980). However, proof that a person fits the profile, unsupported by evidence of drug trafficking, proves nothing.
4 United States v. Sokolow, 490 U.S. 1, 109 S.Ct. 1581, 1586, 104 L.Ed.2d 1 (1989). As the Supreme Court has noted, the profile easily fits innocent travellers as well as drug traffickers.
Reid, 448 U.S. at 441, 100 S.Ct. at 2754;
Sokolow, 109 S.Ct. at 1586. Thus, the government’s claim as to the probative value of this testimony is grossly exaggerated. If there were any evidence linking appellant to the drug trade, the probative value of this testimony might more closely resemble the government’s representations. The government, however, has come forth with no such evidence.
5 Consequent
4
Appellant does not argue that this evidence fails to meet the threshold definition of “relevant evidence" under Fed.R.Evid. 401. Consequently, we assume that the drug courier testimony meets this liberal requirement.
5
This is a distinguishing point between this case and United States v. Hattaway, 740 F.2d 1419, 1425 (7th Cir.), cert. denied, 469 U.S. 1089, 105 S.Ct. 599, 83 L.Ed.2d 708 (1984); United States v. Harrell, 737 F.2d 971, 977-78 (11th Cir.1984), cert. denied, 470 U.S. 1027, 105 S.Ct. *1581392, 84 L.Ed.2d 781 (1985), the cases relied upon by the government. In both cases, the trial court let in evidence of the practices and customs of a motorcycle gang in a trial of known gang members and affiliates. Here there is simply no similar evidence that appellant is a drug courier or that links him in any way to the drug trade. The government’s analogy fails in at least one other respect. Unlike motorcycle gangs, drug couriers are not a cognizable group with unifying customs and codes of conduct that guide the way they operate. Thus, even if there were some corroborative proof that appellant was a drug courier, the government's reliance on Hatt-away and Harrell would be misplaced.