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The future of any historical site can change in a matter of moments . There is no certainty that the United States can proceed with deployment of a limited NMD system and also reassure Russia , China , U.S. allies , and other states that it has benign strategic intentions in doing so . One thing we all can agree on is that we need such benchmarks . However , small amounts of contaminants can remain on floors , walls , counters , carpets , furniture , sinks , drains and ventilation systems . In Pennsylvania , The Bucks County Courier Times ( Sept. 17 , 1999 ) reports that one family has challenged PennDOT 's new policy limiting the time memorials can remain on the state 's roadways . In other words , anti-tumor immune responses can function as a “ double-edged ” sword exerting both host-protective and tumor-sculpting effects on developing tumors . A particular class session cannot last for the entire semester , but the materials can remain on the institution 's server for the duration of its use in one or more courses . Neither the BFI nor the Register can function as a ' broker ' for matching Tutors and clients .