Look maybe I'm wrong. I'll fully admit that's possible, but I'm under the impression that former players count as boosters. This article about Iowa violations seems to indicate that's true.
http://www.usatoday.com/sports/college/mensbasketball/bigten/2010-10-31-iowa-ncaa-violations-kutcher-moore_N.htm?AID=4992781&PID=4169806&SID=bclbapja83yp"Athletic officials acknowledge that they allowed two high school recruits to meet Kutcher, Moore and several former Hawkeye basketball players, according to records obtained by The Des Moines Register under Iowa's public records law.
NCAA rules prohibit potential high school recruits from having any contact with individuals considered to represent a university's athletic interests because of the potential influence boosters can have on the recruiting process.
The university's report to the NCAA indicates that new head basketball coach Fran McCaffery's recruits met with former Hawkeye basketball players Reggie Evans and Dean Oliver after a pick-up game at Carver-Hawkeye Arena— then met Kutcher and Moore in a suite at the football stadium later that day.
Evans, Oliver and Kutcher are considered representatives of Hawkeye athletic interests, the school has told the NCAA."
Now not sure how they'd qualify Davis, but as a former player of Lavin's you would think he'd count against them.
And here's an opinion piece about UNC and former players playing pick up with a recruit:
http://www.statefansnation.com/index.php/archives/2007/09/20/unc-hoops-breaks-recruiting-rules/ Now this turned out not to be a violation because the players were taking courses at UNC at the time so it was legal. Perhaps this was true of the UCLA players as well. Other wise it was a violation.
As the blog states: "Alums can inadvertently ‘bump into’ players when they happen to be on campus at the same time; but they cannot engage in activities to recruit the player to campus."
now obviously I don't know what was said between the two and maybe it didn't violate the letter of the law. But it definitely violated the spirit of the law. It's not like Kyle was wandering around campus unattended and Baron Davis just happened to be shooting around. So while i'm sure St. John's would claim inadvertent contact, it clearly wasn't. I'm not saying this doesn't go on every where, because it does. I'm just saying it's technically a violation based on my understanding of the rules.
Edit:
I will add it must not be a violation since it's being so openly talked about. But in theory one would think that Davis is a representative of Lavin's interests, so should count. Clearly he must not since it's so well publicized.