...
wut?
In most democracies (certainly in Britain) a police officer must have "reasonable suspicion" that there are grounds to conduct a search of a person, building, vehicle, device etc. There must be some basis for the officer’s belief, related to you personally, which can be considered and evaluated by an objective third person. Mere suspicion based on hunch or instinct might justify observation but cannot justify a search.
However, reasonable suspicion can sometimes exist without specific information or intelligence and on the basis of some level of generalisation stemming from the behaviour of a person. For example, if an officer encounters someone on the street at night obviously trying to hide something, this clearly constitutes conduct that might reasonably lead the officer to suspect that stolen or prohibited articles are being carried.
The power must be used fairly, responsibly, with respect for people being searched and without unlawful discrimination. This would include discrimination on grounds of race, colour, ethnic origin, nationality or national origin. Accordingly, reasonable grounds for suspicion cannot be based solely on attitudes or prejudices towards certain types of people, such as membership of a group within which offenders of a certain kind are relatively common - for example, young football fans. Nor can it be based solely on your skin colour, age, hairstyle, mode of dress.
Whoever the "we" is in that quote (The US Department of Homeland Security’s civil rights watchdog) has decided that to impose such a requirement on DHS officers would harm the operational effectiveness of the DHS without accompanying ("concomitant") benefits to the civil rights of potential searched people.
The European Court of Human Rights has held that such searches are in breach of Article 8 of the The European Convention on Human Rights. Article 8 of the ECHR says:
1 Everyone has the right to respect for his private and family life, his home and his correspondence.
2 There shall be no interference by a public authority with the exercise of this right except such as is in accordance with the law and is necessary in a democratic society in the interests of national security, public safety or the economic well being of the country, for the prevention of disorder or crime, for the protection of health or morals, or for the protection of the rights and freedoms of others.