TOKYO —A decision to grant bail to Carlos Ghosn could risk "destruction of evidence" in the financial misconduct case against the former Nissan chief, a senior Tokyo prosecutor said Friday.

Ghosn walked out of a local jail Wednesday after more than 100 days of detention following an unexpected decision from the Tokyo District Court, despite strong opposition from prosecutors.

Ghosn has strict limits on his movement and communications, with a ban on his contacting Nissan executives and others with links to the allegations against him, as well as restrictions on his computer and cell phone use.

But the prosecution still "believes that there remains risk of destruction of evidence", said Shin Kukimoto, deputy chief of the Tokyo District Public Prosecutors Office. "We believe the conditions for the bail are not effective," he added.

Kukimoto said his office would nonetheless work with the new conditions and prove the charges against Ghosn. The prosecutor stayed tight-lipped about whether Ghosn, who is on a one billion yen ($9 million) bond, may face re-arrest or new charges.

While on bail Ghosn, who had two previous bail applications rejected, will live at a designated residence with a surveillance camera. He is allowed to go outside but has pledged not to leave Japan and to stay away from the Internet.

Doubters have questioned the effectiveness of the conditions, with Japanese media speculating that Ghosn could easily leave his residence and call or meet people involved in the case.

Ghosn was first arrested on Nov. 19, and faces multiple charges of financial misconduct. A towering figure once revered in Japan for turning around Nissan's fortunes, Ghosn also forged a successful alliance between Nissan, Mitsubishi Motors and France's Renault.

Ghosn has maintained his innocence since his arrest and claimed the allegations against him are part of a "plot" by opponents of greater integration between the three firms.

It may be several months before Ghosn's trial begins and his defense lawyer Junichiro Hironaka said the case was expected to run over a "very long time span".

A lawyer representing Ghosn on Friday apologized for "tainting" the tycoon's reputation by suggesting he disguise himself as a workman to leave detention on bail.

Ghosn sparked confusion and some derision by walking out of a Tokyo jail on Wednesday after more than 100 days in custody, sporting a blue construction worker's jacket, a light blue cap and a facemask.

Lawyer Takashi Takano said the bizarre get-up was a bid to protect Ghosn's privacy, and particularly to avoid media tracking him to the residence where he will live while out on bail.

But Takano acknowledged the plan backfired, with the world's media instead snapping photos and filming video of Ghosn, transformed from his previously suave executive image.

"The disguise was all planned and carried out by me," Takano wrote in a blog article posted Friday. "Due to my amateur plan, the fame he has built over a lifetime was tainted."

"I caused tangible and intangible damage to many people. I feel sorry about that," he added. Takano said his only goal had been to prevent the media from locating Ghosn's residence.

"Not only would he not be able to have his life back but also his health would be damaged," if the home was located, Takano said. "The life of his family and his neighbors would be threatened. We definitely needed to avoid such a situation."

However, Japanese media on Friday filmed Ghosn with his wife and one of his daughters outside his Tokyo residence. Footage aired on television showed the family walking in a park during the afternoon.

As they returned several hours later by car, a press pack crowded around Ghosn but he did not make any comment. On the day of his release, Ghosn was widely filmed and photographed in the bizarre disguise, including as he got into a minivan complete with a workman's ladder. Media in helicopters and on motorbikes later tracked the vehicle around Tokyo. — Agencies