Possession of Methamphetamine

so I'll start off at the

beginning...my son recently

moved out into a place with two

other roommates, apparently

there is drug activity that goes

on at this house because the

police raided the place

searching for narcotics. Now

they say that they found an

empty bag containing

methamphetamine residue in

my sons bedroom, he was not

home at the time when this raid

took place so they told his

roommate to have my son get a

hold of them because they need

to speak with him and if he

does not get a hold of them

within a reasonable amount of

time they will issue a felony

warrant for his arrest. Now my

question is, how likely is it that

a good lawyer could get him out

of this mess? He is not on a

lease but does have mail

delivered there, he has a

bedroom that is basically a

spare room for friends of his

roommate so it could belong to

someone else, he claims it is

not his and yes, he may be

telling me that cause I'm his

parent but still it could belong

to someone else and I'm not

sure if this helps his case but

he doesn't even have a real

door on his bedroom; it's a

curtain. Also, he has been home

in a different town with us for

the majority of the time that

he's lived there so is there a

good chance of gettting him out

of this sticky situation??