Should the police be able to search the cell phone of someone they are arresting?

Part 1) Should the police be able to search the cell phone of someone they are arresting? If they genuinely believe there is time sensitive evidence on there, should they have to get a warrant? As technology continues to advance, what potential hazards do you see in regards to civil liberties? Part 2) Is America a racist nation? Is America a sexist nation? Why or why not? Do we focus too much on the “Ism’s” to our own detriment as a nation? Obviously this post will become very opinionated. To get any credit you must use and cite facts to back up your argument. Be sure to use full detail here, cite sources, edit, proofread, organize your thoughts,etc. Write in third person.