The NCAA is trimming the gray area from eligibility rules for underclassmen entering the NBA draft.

However, player-agent Bill Neff said that's a futile exercise, with many in his profession cutting under-the-table deals with players.

The NCAA recently distributed a four-page memo, reminding schools what underclassmen can and cannot do to test their NBA marketability. The memo warns underclassmen not to accept travel expenses from NBA basketball teams, though that's been common practice in the past.

One of the authors of that memo said its purpose is heading off trouble and, potentially, holding rule-breakers accountable.

"It's fair to say we've had multiple student-athletes facing possible violations of NCAA rules," said Rachel Newman Baker, the NCAA's director of agent, gambling and amateurism activities. "We're trying to avoid (those problems), so we're not dealing with it next semester."

The NCAA now requires underclassmen in the draft to sign forms, stating they know the rules and understand the risk to their eligibility.

"We want it very clear up front," Newman Baker said, "if we do get into investigating a case, the `I-didn't-know' answer will not work."

The NCAA dealt with messy situations the past few years, involving former Connecticut forward Charlie Villanueva and current Kentucky center Randolph Morris. Each turned pro and had contact with an agent, only to pull out of the draft and seek to play college basketball.