Former Brazilian President Luiz Inacio Lula da Silva waves at supporters from a window of the Workers Party (PT) state headquarters in Sao Paulo, Brazil, on March 4, 2016.   Police searched the home of Brazil's powerful ex-president Luiz Inacio Lula da Silva and detained him for questioning Friday in a probe into a huge corruption scheme. The detention of Lula da Silva for questioning and the search of his home by officers probing a corruption network amounts to an attack on the rule of law, his spokesman said Friday. AFP PHOTO / NELSON ALMEIDA / AFP / NELSON ALMEIDA        (Photo credit should read NELSON ALMEIDA/AFP/Getty Images)