SAN FRANCISCO -- Kathy Hoskins, Barry Bonds' one-time personal shopper and the sister of earlier witness Steve Hoskins, testified Thursday at Bonds' federal perjury trial to having seen trainer Greg Anderson inject Bonds with a syringe before a Giants road trip in 2002.

As the trial wrapped up its second week, Kathy Hoskins' testimony took place after Dr. Arthur Ting, Bonds' former orthopedic surgeon, contradicted several points of earlier testimony from Steve Hoskins, sending the defense and the prosecution into a heated exchange over the discrepancies and what the government knew about them before the trial began.

Bonds, the all-time leader in home runs and a seven-time Most Valuable Player, is standing trial on four counts of perjury and one count of obstruction of justice, charges based on his testimony before the Bay Area Laboratory Co-Operative (BALCO) grand jury in which he denied knowingly using performance-enhancing drugs.

Kathy Hoskins testified that part of what she did for Bonds was pack his belongings for road trips in 2002. On direct examination from Assistant U.S. District Attorney Matthew Parrella, Hoskins said she had seen Anderson and Bonds go into an office at Bonds' home and come out a few minutes later on numerous occasions. She also described the one time she was packing for Bonds when Anderson entered the bedroom along with Bonds, and she witnessed the injection.

"Greg shot him in the belly button," Hoskins testified, adding that Bonds allowed the injection to take place in her presence and told Anderson it was OK: "Barry just lifted his shirt. This is Katie, she's my girl," Hoskins said.

Hoskins said it was a "regular, normal syringe" and that Bonds told her, "That's a little something-something before I go on the road. You can't detect it. You can't catch it."

Count Two of the indictment in this case specifies that Bonds gave false statements to the grand jury when he testified that no one other than a physician ever had injected him before, either to take something out or put something in. "But no other individuals like Mr. Anderson or any of his associates?" he was asked. Bonds responded, "No, no."

Dr. Don Catlin, founder of the UCLA Olympic Analytical Laboratory, was on the stand as the final witness expected to be called by the prosecution. When the trial resumes Monday following a weekend recess, the prosecution is expected to also have Bonds' grand-jury testimony read for the jury before resting its case.

Earlier in the day, Dr. Ting testified that he did in fact have a conversation with Steve Hoskins about a steroid and gave Hoskins literature about the relationship between steroids and tendon injuries sometime in 1999, as Hoskins had testified. But that was the only conversation he had with Hoskins on the subject, Ting said -- whereas Hoskins testified that he had "maybe 50" such meetings with Ting. The surgeon also denied ever talking to Bonds about steroids, and contradicted Hoskins' testimony that he had told Hoskins that Bonds' 1999 elbow injury that required surgery was caused by steroid use.

The discrepancies in the testimony, the lack of notes from a meeting with Dr. Ting that preceded his grand-jury testimony in 2006 and other issues sent Cristina Arguedas and Assistant U.S. District Attorney Jeffrey Nedrow into a contentious series of arguments before Judge Susan Illston, outside the presence of the jury. Arguedas also raised an earlier issue regarding mistress Kimberly Bell's diary, which had two versions -- one elaborated upon by fired co-author Aphrodite Jones, another that was only in Bell's -- but the defense wasn't aware of that until Bell took the stand. The defense has requested a hearing on the matters.

Ting also testified on cross with Arguedas that he had prescribed Bonds corticosteroids -- and that those drugs have many of the same side effects as anabolic steroids, such as acne, bloating, mood swings and sexual dysfunction, all side effects Bell in particular noticed Bonds suffered.

The testimony by Kathy Hoskins began by establishing her relationship with Bonds. She and her brother, Steve, grew up friends with Bonds and his family, and Kathy even asked Barry Bonds to a Sadie Hawkins dance when they were freshmen in high school. Like Steve, she lost touch with Bonds after high school but reconnected when Bonds arrived as a free agent to play with the Giants in 1993. She introduced Kimberly Bell to Bonds but didn't have a lot of interaction with him until she suggested to Bonds in 2001 that she could shop for clothes for him better than he could. He took her up on that, and would give her about $3,000 at a time to shop for clothes, letting her keep the change or paying her on top of that.

On cross-examination, Hoskins said she was aware that her brother and Bonds had a falling out -- Bonds presented Hoskins with a letter laying out the terms of their separation in March 2003 -- when she and Steve were interviewed by federal agent Jeff Novitzky and others on Feb. 22, 2006, as the government was building its perjury case against Bonds. But she didn't inquire as to why. "It was none of my business," she said.

But she became part of the case when her brother informed investigators that she had seen Anderson inject Bonds. She testified she told Steve Hoskins about the episode shortly after she saw it, but she had no intention of becoming involved in this case.

"I didn't have anything to do with it," she testified. "[Steve Hoskins] threw me under the bus and that's why I'm on here," adding shortly thereafter, "I didn't run around going, 'Where's the FBI? I know something.'"

Later, asked again by Parrella whether testifying was something she was happy about, Hoskins became emotional.

"I feel like I was put in the middle of it," she said.