You can only use this argument if you believe the police are in my house "lawfully" while looking for a suspect. According to your earlier posts you believe the police presence in Boston to be unlawful, therefore the plain view doctrine would not be applicable.The police have no probable cause to believe there is a terror suspect in anyone's house just based on the suspect's last known location. I don't know about you, but I don't want to spend a half hour on my front lawn while police search my house the next time a multiple homicide offender is on the loose. I don't have a meth lab or secret weed stash, either. The 4th amendment isn't about protecting criminals, no matter how many cynical prosecutors and police officers think it is. It is common sense to not allow police to conduct door-to-door property searches to catch a criminal, even if he's a mass murderer.
Also, if police enter your house to look for a person and see illegal contraband on the table, they can arrest you under the plain view doctrine. They probably won't in lieu of pursuing the murderer, but they can.
http://policelink.monster.com/training/articles/2043-plain-view-doctrine-