alot of times homicide cops deal with gang related graffiti, so they keep files of flicks of graff along with names and faces they can attach to them, mainly because theyll catch gang members marking territory, and they keep them on file, but dont put it past them to group you in with them. did he take a flick of your face? if he took your info he probably wrote down what you are writing, so a name change wouldnt hurt. definitely clean that shit off though, otherwise he could charge you with criminal trespass, damage to personal property (or federal property depending on what you wrote on, which is an automatic felony), and i could go on if i knew exactly what happened. and dont be surprised if you have a cop come to your house and ask you to come to the station to look at pictures of graff and answer some questions. ive come to learn that cops arent good at all at figuring out how to find a writer unless they have a picture of you DOING graffiti. if they dont have you on camera doing it dont admit to shit. theyll show you pics, ask you questions like "you didnt do this?" "do you know of anyone who does graffiti" "you look like you have something on your mind, do you want to tell me something". i dont care if you wrote your full name, address, and social security number on a wall, you didnt do it unless they have you on camera, and even still it has to be 60% recognizable, it cant "kind of" look like you, but they will lie to you, tell you they know you did it, ask you the same question 3 times but phrased differently each time, just trying to catch you slippin. just remember you can say "i would like to terminate this discussion" at any time, and they cant legally ask you any more questions, so if you get caught being pushed into a corner by them, just remember to use your legal lifeline. and if you fill out a police report, make sure you write "im not affiliated with graffiti nor do i know anyone affiliated with it". and if they show up/call you again to come in and answer more questions, tell them what you wrote in the police report and if they want to talk to you that you can have your lawyer contact them and set up a time (even though you dont have one) because they will NEVER call your bluff unless, again, they have you on camera doing it. if you have any more questions just ask, hopefully that helps, sorry i put it in rant form and used horrible grammar.
also, if he was in a suit why didnt you use them legs son? find some trees to sprint through and see if the motherfucker wants to risk fucking his threads up over some graffiti.