A defendant can't immediately appeal the denial of a motion to suppress evidence. Should your friend take the case all the way to trial and lose, he can then raise that denial as one of the issues in his appeal.
This is not appealed until after trial. Part of the reason is that the person could be found not guilty at trial and therefore there is no need for the appeal. While sometimes that is not really a possibility, that is part of the procedural rules and therefore must be done in this manner.
Rulings on motins to suppress generally are not appealable until after a trial, because it won't matter if there is no conviction. The principle is to allow appeals only after a conviction to save judicial resources. Also, taking an interlocutory appeal, if one is available, is time consuming and expensive.
This answer does not create an attorney-client relationship. It is advisable to consult with an attorney with full disclosure of relevant facts for a comprehensive leagl opinion.