touch anything before the police will come vs touch anything before the police comes

Some examples from the web:

• Don't touch anything before the forensics get here.
• The police will come looking for you.
• The police will come with a warrant.
• The police will come looking for a killer.
• The police will come after you.
• Otherwise, the police will come and take you away.
• In a few minutes the police will come.
• The police will come soon, I know.
• Most likely the police will come here sooner or later anyway.
• Otherwise, the police will come and take you away.
• - Are you sure that the police will come?
• The police will come and ask you questions
• I'm warning you, the police will come looking for me.
• I'm afraid if we put our weapons down, the police will come and beat us.
• The police will find blood samples to support our deaths, and no one will come looking for us.
• But you must go to school, or else the police will come.
• The police will come after me!
• And the police will come and visit you and tell you how sorry they are but that, sadly, it isn't that uncommon.
• Either your son surrenders within the hour, or all the police will come crashing through this door twice a day for as long as it takes you people to get the message.
• No. We mustn't touch anything until the police arrive.

Some examples from the web:

• Don't touch anything before the forensics get here.
• Mr. Kringelein, I must talk with you before the police come.
• Let's go before the police comes.
• But you've got to return it before the police come.
• If you don't mind, I'd like to finish the second-floor inventory before the police come by and turn this place upside down.
• We're getting out of here before the police come.
• No. We mustn't touch anything until the police arrive.
• And now, my dear, dear friends, before the police come and the audience gathers, you and your pretty baby must go.
• If you touch anything else or cause more trouble, I'm really calling the police.
• I can't be here when the police come.
• Sometimes the police come and study them to help with their cases.
• If the police come, pat your gun.
• The police come by once, and I never see you again.
• I can not be here when the police come.
• And if the police come sniffing, keep it shut.
• The police come around, and that's bad for business.
• I just want to warn the police come tomorrow.
• The police come in the night.
• Well, that'll hold her till the police come.
• You know what it means if the police come.